Fix naming issue in stress_test
Fix naming issue in stress_test

(via ahh@google.com)
Under some configurations gRPC includes google3 base headers.  google3
has a namespace "thread" which mixes poorly with unqualified use of the
type std::thread; adding that namespace to various google3 headers
breaks this test.

ipylypiv/grpc,ctiller/grpc,stanley-cheung/grpc,ctiller/grpc,tamihiro/grpc,PeterFaiman/ruby-grpc-minimal,grpc/grpc,rjshade/grpc,grpc/grpc,a-veitch/grpc,leifurhauks/grpc,msiedlarek/grpc,chrisdunelm/grpc,kskalski/grpc,yugui/grpc,w4-sjcho/grpc,firebase/grpc,leifurhauks/grpc,yugui/grpc,pszemus/grpc,apolcyn/grpc,kriswuollett/grpc,hstefan/grpc,deepaklukose/grpc,greasypizza/grpc,a11r/grpc,nicolasnoble/grpc,kskalski/grpc,ejona86/grpc,kumaralokgithub/grpc,geffzhang/grpc,firebase/grpc,rjshade/grpc,baylabs/grpc,malexzx/grpc,grpc/grpc,MakMukhi/grpc,thinkerou/grpc,pszemus/grpc,malexzx/grpc,jboeuf/grpc,madongfly/grpc,jboeuf/grpc,pmarks-net/grpc,makdharma/grpc,PeterFaiman/ruby-grpc-minimal,kumaralokgithub/grpc,soltanmm/grpc,vsco/grpc,zhimingxie/grpc,a-veitch/grpc,zhimingxie/grpc,jtattermusch/grpc,rjshade/grpc,dklempner/grpc,daniel-j-born/grpc,matt-kwong/grpc,thunderboltsid/grpc,soltanmm-google/grpc,carl-mastrangelo/grpc,mehrdada/grpc,grpc/grpc,yang-g/grpc,perumaalgoog/grpc,dgquintas/grpc,w4-sjcho/grpc,stanley-cheung/grpc,ncteisen/grpc,dgquintas/grpc,y-zeng/grpc,soltanmm-google/grpc,geffzhang/grpc,MakMukhi/grpc,jboeuf/grpc,PeterFaiman/ruby-grpc-minimal,donnadionne/grpc,grani/grpc,sreecha/grpc,thinkerou/grpc,PeterFaiman/ruby-grpc-minimal,miselin/grpc,donnadionne/grpc,chrisdunelm/grpc,Vizerai/grpc,chrisdunelm/grpc,quizlet/grpc,jcanizales/grpc,arkmaxim/grpc,sreecha/grpc,adelez/grpc,apolcyn/grpc,muxi/grpc,daniel-j-born/grpc,nicolasnoble/grpc,ppietrasa/grpc,perumaalgoog/grpc,deepaklukose/grpc,murgatroid99/grpc,baylabs/grpc,w4-sjcho/grpc,tengyifei/grpc,pszemus/grpc,murgatroid99/grpc,fuchsia-mirror/third_party-grpc,soltanmm/grpc,pszemus/grpc,perumaalgoog/grpc,msiedlarek/grpc,msmania/grpc,a11r/grpc,daniel-j-born/grpc,fuchsia-mirror/third_party-grpc,dgquintas/grpc,LuminateWireless/grpc,vsco/grpc,adelez/grpc,y-zeng/grpc,msiedlarek/grpc,vjpai/grpc,hstefan/grpc,makdharma/grpc,yugui/grpc,jcanizales/grpc,baylabs/grpc,apolcyn/grpc,adelez/grpc,dgquintas/grpc,Vizerai/grpc,soltanmm/grpc,adelez/grpc,muxi/grpc,thunderboltsid/grpc,philcleveland/grpc,fuchsia-mirror/third_party-grpc,ejona86/grpc,malexzx/grpc,hstefan/grpc,carl-mastrangelo/grpc,murgatroid99/grpc,kskalski/grpc,VcamX/grpc,sreecha/grpc,greasypizza/grpc,leifurhauks/grpc,andrewpollock/grpc,murgatroid99/grpc,thinkerou/grpc,miselin/grpc,jboeuf/grpc,thinkerou/grpc,kumaralokgithub/grpc,goldenbull/grpc,msmania/grpc,hstefan/grpc,ncteisen/grpc,ipylypiv/grpc,simonkuang/grpc,quizlet/grpc,hstefan/grpc,donnadionne/grpc,chrisdunelm/grpc,jtattermusch/grpc,PeterFaiman/ruby-grpc-minimal,jcanizales/grpc,wcevans/grpc,nicolasnoble/grpc,stanley-cheung/grpc,Vizerai/grpc,mehrdada/grpc,Vizerai/grpc,7anner/grpc,maxwell-demon/grpc,sreecha/grpc,maxwell-demon/grpc,LuminateWireless/grpc,deepaklukose/grpc,donnadionne/grpc,dklempner/grpc,pszemus/grpc,msmania/grpc,tengyifei/grpc,matt-kwong/grpc,jboeuf/grpc,a11r/grpc,ejona86/grpc,Vizerai/grpc,stanley-cheung/grpc,yang-g/grpc,jtattermusch/grpc,infinit/grpc,dklempner/grpc,stanley-cheung/grpc,thunderboltsid/grpc,madongfly/grpc,a-veitch/grpc,matt-kwong/grpc,y-zeng/grpc,thunderboltsid/grpc,apolcyn/grpc,ananthonline/grpc,nicolasnoble/grpc,goldenbull/grpc,simonkuang/grpc,miselin/grpc,donnadionne/grpc,madongfly/grpc,thinkerou/grpc,grani/grpc,wcevans/grpc,hstefan/grpc,adelez/grpc,hstefan/grpc,vjpai/grpc,simonkuang/grpc,muxi/grpc,murgatroid99/grpc,MakMukhi/grpc,goldenbull/grpc,vjpai/grpc,yongni/grpc,sreecha/grpc,infinit/grpc,PeterFaiman/ruby-grpc-minimal,firebase/grpc,bogdandrutu/grpc,philcleveland/grpc,a11r/grpc,Vizerai/grpc,kriswuollett/grpc,PeterFaiman/ruby-grpc-minimal,perumaalgoog/grpc,andrewpollock/grpc,thinkerou/grpc,w4-sjcho/grpc,yugui/grpc,rjshade/grpc,simonkuang/grpc,murgatroid99/grpc,pmarks-net/grpc,greasypizza/grpc,andrewpollock/grpc,daniel-j-born/grpc,pmarks-net/grpc,thunderboltsid/grpc,deepaklukose/grpc,msmania/grpc,zhimingxie/grpc,tengyifei/grpc,firebase/grpc,muxi/grpc,ctiller/grpc,maxwell-demon/grpc,kumaralokgithub/grpc,podsvirov/grpc,miselin/grpc,jboeuf/grpc,baylabs/grpc,greasypizza/grpc,dgquintas/grpc,ppietrasa/grpc,mehrdada/grpc,baylabs/grpc,dklempner/grpc,ipylypiv/grpc,pmarks-net/grpc,wcevans/grpc,MakMukhi/grpc,soltanmm-google/grpc,jtattermusch/grpc,greasypizza/grpc,malexzx/grpc,hstefan/grpc,malexzx/grpc,ejona86/grpc,tengyifei/grpc,chrisdunelm/grpc,ppietrasa/grpc,wcevans/grpc,sreecha/grpc,msmania/grpc,zhimingxie/grpc,muxi/grpc,miselin/grpc,simonkuang/grpc,yugui/grpc,VcamX/grpc,madongfly/grpc,miselin/grpc,tamihiro/grpc,Crevil/grpc,grpc/grpc,thinkerou/grpc,leifurhauks/grpc,apolcyn/grpc,soltanmm/grpc,podsvirov/grpc,muxi/grpc,arkmaxim/grpc,sreecha/grpc,ejona86/grpc,ppietrasa/grpc,daniel-j-born/grpc,7anner/grpc,philcleveland/grpc,kriswuollett/grpc,jtattermusch/grpc,7anner/grpc,stanley-cheung/grpc,miselin/grpc,ipylypiv/grpc,firebase/grpc,kpayson64/grpc,Vizerai/grpc,firebase/grpc,kriswuollett/grpc,kriswuollett/grpc,baylabs/grpc,fuchsia-mirror/third_party-grpc,madongfly/grpc,donnadionne/grpc,tamihiro/grpc,w4-sjcho/grpc,nicolasnoble/grpc,jtattermusch/grpc,adelez/grpc,murgatroid99/grpc,Crevil/grpc,ejona86/grpc,matt-kwong/grpc,MakMukhi/grpc,grpc/grpc,thinkerou/grpc,leifurhauks/grpc,ejona86/grpc,royalharsh/grpc,baylabs/grpc,kpayson64/grpc,kriswuollett/grpc,matt-kwong/grpc,ananthonline/grpc,malexzx/grpc,tengyifei/grpc,thinkerou/grpc,msiedlarek/grpc,kpayson64/grpc,andrewpollock/grpc,ctiller/grpc,kumaralokgithub/grpc,donnadionne/grpc,mehrdada/grpc,miselin/grpc,mehrdada/grpc,baylabs/grpc,bogdandrutu/grpc,simonkuang/grpc,wcevans/grpc,ncteisen/grpc,simonkuang/grpc,quizlet/grpc,msiedlarek/grpc,y-zeng/grpc,andrewpollock/grpc,VcamX/grpc,royalharsh/grpc,kskalski/grpc,maxwell-demon/grpc,royalharsh/grpc,makdharma/grpc,vjpai/grpc,ejona86/grpc,ipylypiv/grpc,thunderboltsid/grpc,geffzhang/grpc,MakMukhi/grpc,tamihiro/grpc,soltanmm-google/grpc,ppietrasa/grpc,greasypizza/grpc,pmarks-net/grpc,tengyifei/grpc,ananthonline/grpc,maxwell-demon/grpc,vsco/grpc,goldenbull/grpc,adelez/grpc,zhimingxie/grpc,grani/grpc,msiedlarek/grpc,kskalski/grpc,arkmaxim/grpc,ncteisen/grpc,soltanmm-google/grpc,bogdandrutu/grpc,ananthonline/grpc,dgquintas/grpc,jboeuf/grpc,bogdandrutu/grpc,tamihiro/grpc,jboeuf/grpc,zhimingxie/grpc,carl-mastrangelo/grpc,LuminateWireless/grpc,greasypizza/grpc,Crevil/grpc,tamihiro/grpc,vsco/grpc,carl-mastrangelo/grpc,podsvirov/grpc,mehrdada/grpc,mehrdada/grpc,ipylypiv/grpc,grani/grpc,carl-mastrangelo/grpc,geffzhang/grpc,muxi/grpc,ananthonline/grpc,geffzhang/grpc,soltanmm-google/grpc,nicolasnoble/grpc,makdharma/grpc,maxwell-demon/grpc,infinit/grpc,philcleveland/grpc,grpc/grpc,infinit/grpc,vjpai/grpc,PeterFaiman/ruby-grpc-minimal,thunderboltsid/grpc,goldenbull/grpc,donnadionne/grpc,bogdandrutu/grpc,yongni/grpc,mehrdada/grpc,podsvirov/grpc,soltanmm/grpc,ctiller/grpc,LuminateWireless/grpc,infinit/grpc,chrisdunelm/grpc,geffzhang/grpc,y-zeng/grpc,goldenbull/grpc,ctiller/grpc,jtattermusch/grpc,yugui/grpc,quizlet/grpc,ncteisen/grpc,vsco/grpc,nicolasnoble/grpc,podsvirov/grpc,makdharma/grpc,Vizerai/grpc,vsco/grpc,maxwell-demon/grpc,a-veitch/grpc,stanley-cheung/grpc,murgatroid99/grpc,yang-g/grpc,ncteisen/grpc,vjpai/grpc,firebase/grpc,rjshade/grpc,wcevans/grpc,stanley-cheung/grpc,tamihiro/grpc,a-veitch/grpc,malexzx/grpc,VcamX/grpc,kskalski/grpc,carl-mastrangelo/grpc,Vizerai/grpc,pszemus/grpc,jtattermusch/grpc,deepaklukose/grpc,chrisdunelm/grpc,greasypizza/grpc,jcanizales/grpc,thinkerou/grpc,stanley-cheung/grpc,kskalski/grpc,Vizerai/grpc,madongfly/grpc,yang-g/grpc,grpc/grpc,muxi/grpc,royalharsh/grpc,wcevans/grpc,jboeuf/grpc,philcleveland/grpc,ananthonline/grpc,wcevans/grpc,LuminateWireless/grpc,jboeuf/grpc,makdharma/grpc,yongni/grpc,makdharma/grpc,rjshade/grpc,a-veitch/grpc,jcanizales/grpc,vjpai/grpc,yugui/grpc,LuminateWireless/grpc,yugui/grpc,yugui/grpc,perumaalgoog/grpc,bogdandrutu/grpc,PeterFaiman/ruby-grpc-minimal,arkmaxim/grpc,sreecha/grpc,7anner/grpc,ncteisen/grpc,grani/grpc,deepaklukose/grpc,dgquintas/grpc,a11r/grpc,carl-mastrangelo/grpc,tengyifei/grpc,msmania/grpc,maxwell-demon/grpc,nicolasnoble/grpc,dgquintas/grpc,carl-mastrangelo/grpc,yongni/grpc,perumaalgoog/grpc,dklempner/grpc,dgquintas/grpc,rjshade/grpc,MakMukhi/grpc,ppietrasa/grpc,ipylypiv/grpc,goldenbull/grpc,geffzhang/grpc,jcanizales/grpc,arkmaxim/grpc,zhimingxie/grpc,muxi/grpc,soltanmm-google/grpc,jboeuf/grpc,donnadionne/grpc,soltanmm-google/grpc,w4-sjcho/grpc,apolcyn/grpc,perumaalgoog/grpc,ctiller/grpc,dklempner/grpc,kumaralokgithub/grpc,7anner/grpc,kpayson64/grpc,ejona86/grpc,goldenbull/grpc,a11r/grpc,zhimingxie/grpc,kpayson64/grpc,VcamX/grpc,perumaalgoog/grpc,infinit/grpc,arkmaxim/grpc,ncteisen/grpc,matt-kwong/grpc,grani/grpc,carl-mastrangelo/grpc,yongni/grpc,philcleveland/grpc,grani/grpc,ncteisen/grpc,vjpai/grpc,ppietrasa/grpc,nicolasnoble/grpc,VcamX/grpc,andrewpollock/grpc,thunderboltsid/grpc,infinit/grpc,goldenbull/grpc,andrewpollock/grpc,leifurhauks/grpc,dklempner/grpc,deepaklukose/grpc,yongni/grpc,chrisdunelm/grpc,muxi/grpc,tamihiro/grpc,ejona86/grpc,yang-g/grpc,a11r/grpc,daniel-j-born/grpc,daniel-j-born/grpc,adelez/grpc,vsco/grpc,ctiller/grpc,kskalski/grpc,y-zeng/grpc,PeterFaiman/ruby-grpc-minimal,nicolasnoble/grpc,msmania/grpc,pmarks-net/grpc,kpayson64/grpc,rjshade/grpc,ppietrasa/grpc,w4-sjcho/grpc,simonkuang/grpc,rjshade/grpc,vjpai/grpc,Vizerai/grpc,7anner/grpc,matt-kwong/grpc,y-zeng/grpc,Crevil/grpc,apolcyn/grpc,jtattermusch/grpc,ncteisen/grpc,w4-sjcho/grpc,yang-g/grpc,chrisdunelm/grpc,geffzhang/grpc,grpc/grpc,donnadionne/grpc,podsvirov/grpc,makdharma/grpc,nicolasnoble/grpc,kriswuollett/grpc,Crevil/grpc,7anner/grpc,soltanmm/grpc,vsco/grpc,mehrdada/grpc,maxwell-demon/grpc,vjpai/grpc,jtattermusch/grpc,arkmaxim/grpc,hstefan/grpc,kumaralokgithub/grpc,MakMukhi/grpc,carl-mastrangelo/grpc,kpayson64/grpc,arkmaxim/grpc,LuminateWireless/grpc,VcamX/grpc,vsco/grpc,MakMukhi/grpc,jtattermusch/grpc,mehrdada/grpc,kumaralokgithub/grpc,soltanmm/grpc,pszemus/grpc,pszemus/grpc,ncteisen/grpc,yang-g/grpc,podsvirov/grpc,ejona86/grpc,a-veitch/grpc,soltanmm/grpc,makdharma/grpc,ctiller/grpc,fuchsia-mirror/third_party-grpc,pmarks-net/grpc,dgquintas/grpc,a11r/grpc,tamihiro/grpc,jcanizales/grpc,royalharsh/grpc,msmania/grpc,murgatroid99/grpc,nicolasnoble/grpc,geffzhang/grpc,thinkerou/grpc,7anner/grpc,fuchsia-mirror/third_party-grpc,chrisdunelm/grpc,msiedlarek/grpc,philcleveland/grpc,bogdandrutu/grpc,philcleveland/grpc,quizlet/grpc,madongfly/grpc,ipylypiv/grpc,mehrdada/grpc,pszemus/grpc,ctiller/grpc,pmarks-net/grpc,zhimingxie/grpc,madongfly/grpc,tengyifei/grpc,yang-g/grpc,LuminateWireless/grpc,msiedlarek/grpc,kskalski/grpc,andrewpollock/grpc,royalharsh/grpc,muxi/grpc,a-veitch/grpc,arkmaxim/grpc,leifurhauks/grpc,kumaralokgithub/grpc,Crevil/grpc,chrisdunelm/grpc,grpc/grpc,dklempner/grpc,pmarks-net/grpc,miselin/grpc,firebase/grpc,apolcyn/grpc,deepaklukose/grpc,Crevil/grpc,stanley-cheung/grpc,simonkuang/grpc,pszemus/grpc,royalharsh/grpc,bogdandrutu/grpc,jcanizales/grpc,yongni/grpc,ctiller/grpc,jcanizales/grpc,ipylypiv/grpc,ctiller/grpc,yongni/grpc,sreecha/grpc,ppietrasa/grpc,firebase/grpc,quizlet/grpc,ananthonline/grpc,ejona86/grpc,daniel-j-born/grpc,kriswuollett/grpc,soltanmm-google/grpc,grpc/grpc,mehrdada/grpc,wcevans/grpc,royalharsh/grpc,Crevil/grpc,daniel-j-born/grpc,quizlet/grpc,muxi/grpc,vjpai/grpc,ncteisen/grpc,LuminateWireless/grpc,pszemus/grpc,adelez/grpc,perumaalgoog/grpc,carl-mastrangelo/grpc,stanley-cheung/grpc,y-zeng/grpc,thinkerou/grpc,7anner/grpc,murgatroid99/grpc,sreecha/grpc,firebase/grpc,firebase/grpc,kpayson64/grpc,jboeuf/grpc,y-zeng/grpc,kriswuollett/grpc,a11r/grpc,greasypizza/grpc,sreecha/grpc,w4-sjcho/grpc,msiedlarek/grpc,deepaklukose/grpc,matt-kwong/grpc,malexzx/grpc,carl-mastrangelo/grpc,podsvirov/grpc,kpayson64/grpc,leifurhauks/grpc,dklempner/grpc,soltanmm/grpc,yang-g/grpc,matt-kwong/grpc,fuchsia-mirror/third_party-grpc,madongfly/grpc,kpayson64/grpc,royalharsh/grpc,pszemus/grpc,quizlet/grpc,leifurhauks/grpc,infinit/grpc,stanley-cheung/grpc,donnadionne/grpc,msmania/grpc,apolcyn/grpc,infinit/grpc,vjpai/grpc,philcleveland/grpc,tengyifei/grpc,kpayson64/grpc,bogdandrutu/grpc,VcamX/grpc,grani/grpc,donnadionne/grpc,VcamX/grpc,jtattermusch/grpc,ananthonline/grpc,a-veitch/grpc,yongni/grpc,fuchsia-mirror/third_party-grpc,malexzx/grpc,fuchsia-mirror/third_party-grpc,sreecha/grpc,dgquintas/grpc,andrewpollock/grpc,ananthonline/grpc,podsvirov/grpc,Crevil/grpc,quizlet/grpc,thunderboltsid/grpc,grpc/grpc,fuchsia-mirror/third_party-grpc,grani/grpc,firebase/grpc,baylabs/grpc