Added testcases/java__master for interop_matrix.
Added testcases/java__master for interop_matrix.

adelez/grpc,msmania/grpc,ncteisen/grpc,matt-kwong/grpc,nicolasnoble/grpc,simonkuang/grpc,jboeuf/grpc,fuchsia-mirror/third_party-grpc,thinkerou/grpc,ejona86/grpc,Vizerai/grpc,chrisdunelm/grpc,jtattermusch/grpc,msmania/grpc,thinkerou/grpc,PeterFaiman/ruby-grpc-minimal,deepaklukose/grpc,jboeuf/grpc,yongni/grpc,ctiller/grpc,grpc/grpc,firebase/grpc,ejona86/grpc,chrisdunelm/grpc,jtattermusch/grpc,mehrdada/grpc,murgatroid99/grpc,mehrdada/grpc,carl-mastrangelo/grpc,firebase/grpc,mehrdada/grpc,carl-mastrangelo/grpc,ejona86/grpc,Vizerai/grpc,stanley-cheung/grpc,nicolasnoble/grpc,pszemus/grpc,carl-mastrangelo/grpc,ejona86/grpc,kpayson64/grpc,geffzhang/grpc,kpayson64/grpc,simonkuang/grpc,jtattermusch/grpc,stanley-cheung/grpc,vjpai/grpc,simonkuang/grpc,dgquintas/grpc,stanley-cheung/grpc,jboeuf/grpc,Crevil/grpc,kumaralokgithub/grpc,daniel-j-born/grpc,PeterFaiman/ruby-grpc-minimal,kumaralokgithub/grpc,carl-mastrangelo/grpc,quizlet/grpc,chrisdunelm/grpc,geffzhang/grpc,murgatroid99/grpc,mehrdada/grpc,ncteisen/grpc,mehrdada/grpc,firebase/grpc,kumaralokgithub/grpc,kumaralokgithub/grpc,matt-kwong/grpc,muxi/grpc,matt-kwong/grpc,donnadionne/grpc,msmania/grpc,daniel-j-born/grpc,geffzhang/grpc,Vizerai/grpc,kskalski/grpc,muxi/grpc,Crevil/grpc,murgatroid99/grpc,adelez/grpc,chrisdunelm/grpc,ctiller/grpc,msmania/grpc,jboeuf/grpc,zhimingxie/grpc,thinkerou/grpc,firebase/grpc,grpc/grpc,muxi/grpc,muxi/grpc,vjpai/grpc,murgatroid99/grpc,firebase/grpc,ncteisen/grpc,msmania/grpc,firebase/grpc,jboeuf/grpc,grpc/grpc,kpayson64/grpc,stanley-cheung/grpc,adelez/grpc,daniel-j-born/grpc,quizlet/grpc,quizlet/grpc,kpayson64/grpc,sreecha/grpc,vjpai/grpc,muxi/grpc,pszemus/grpc,ejona86/grpc,simonkuang/grpc,ncteisen/grpc,daniel-j-born/grpc,nicolasnoble/grpc,kpayson64/grpc,yang-g/grpc,donnadionne/grpc,ncteisen/grpc,nicolasnoble/grpc,dgquintas/grpc,yongni/grpc,grpc/grpc,simonkuang/grpc,matt-kwong/grpc,ejona86/grpc,ctiller/grpc,geffzhang/grpc,donnadionne/grpc,firebase/grpc,donnadionne/grpc,jboeuf/grpc,matt-kwong/grpc,PeterFaiman/ruby-grpc-minimal,jtattermusch/grpc,vjpai/grpc,nicolasnoble/grpc,sreecha/grpc,zhimingxie/grpc,grpc/grpc,fuchsia-mirror/third_party-grpc,yang-g/grpc,sreecha/grpc,sreecha/grpc,chrisdunelm/grpc,carl-mastrangelo/grpc,yang-g/grpc,thinkerou/grpc,yongni/grpc,sreecha/grpc,murgatroid99/grpc,msmania/grpc,adelez/grpc,jtattermusch/grpc,matt-kwong/grpc,vjpai/grpc,jboeuf/grpc,jtattermusch/grpc,ejona86/grpc,kskalski/grpc,zhimingxie/grpc,nicolasnoble/grpc,Crevil/grpc,yang-g/grpc,nicolasnoble/grpc,murgatroid99/grpc,jboeuf/grpc,dgquintas/grpc,PeterFaiman/ruby-grpc-minimal,daniel-j-born/grpc,grpc/grpc,adelez/grpc,donnadionne/grpc,mehrdada/grpc,pszemus/grpc,mehrdada/grpc,murgatroid99/grpc,adelez/grpc,nicolasnoble/grpc,Crevil/grpc,grpc/grpc,yongni/grpc,grpc/grpc,stanley-cheung/grpc,kskalski/grpc,dgquintas/grpc,jboeuf/grpc,sreecha/grpc,ncteisen/grpc,pszemus/grpc,deepaklukose/grpc,matt-kwong/grpc,pszemus/grpc,firebase/grpc,carl-mastrangelo/grpc,fuchsia-mirror/third_party-grpc,ncteisen/grpc,deepaklukose/grpc,mehrdada/grpc,zhimingxie/grpc,simonkuang/grpc,ctiller/grpc,thinkerou/grpc,kskalski/grpc,kpayson64/grpc,stanley-cheung/grpc,jtattermusch/grpc,stanley-cheung/grpc,simonkuang/grpc,geffzhang/grpc,murgatroid99/grpc,dgquintas/grpc,yongni/grpc,yongni/grpc,pszemus/grpc,Crevil/grpc,chrisdunelm/grpc,pszemus/grpc,stanley-cheung/grpc,carl-mastrangelo/grpc,msmania/grpc,ejona86/grpc,ctiller/grpc,muxi/grpc,nicolasnoble/grpc,sreecha/grpc,sreecha/grpc,muxi/grpc,fuchsia-mirror/third_party-grpc,fuchsia-mirror/third_party-grpc,yongni/grpc,dgquintas/grpc,vjpai/grpc,zhimingxie/grpc,ejona86/grpc,jtattermusch/grpc,dgquintas/grpc,fuchsia-mirror/third_party-grpc,ejona86/grpc,matt-kwong/grpc,kumaralokgithub/grpc,quizlet/grpc,stanley-cheung/grpc,kpayson64/grpc,daniel-j-born/grpc,zhimingxie/grpc,kpayson64/grpc,matt-kwong/grpc,quizlet/grpc,vjpai/grpc,kskalski/grpc,thinkerou/grpc,ncteisen/grpc,chrisdunelm/grpc,jtattermusch/grpc,vjpai/grpc,fuchsia-mirror/third_party-grpc,pszemus/grpc,Vizerai/grpc,kskalski/grpc,daniel-j-born/grpc,donnadionne/grpc,yang-g/grpc,grpc/grpc,deepaklukose/grpc,ncteisen/grpc,fuchsia-mirror/third_party-grpc,nicolasnoble/grpc,PeterFaiman/ruby-grpc-minimal,PeterFaiman/ruby-grpc-minimal,Vizerai/grpc,adelez/grpc,yongni/grpc,deepaklukose/grpc,sreecha/grpc,PeterFaiman/ruby-grpc-minimal,zhimingxie/grpc,carl-mastrangelo/grpc,quizlet/grpc,thinkerou/grpc,PeterFaiman/ruby-grpc-minimal,chrisdunelm/grpc,donnadionne/grpc,fuchsia-mirror/third_party-grpc,Crevil/grpc,mehrdada/grpc,yang-g/grpc,ctiller/grpc,nicolasnoble/grpc,adelez/grpc,jtattermusch/grpc,mehrdada/grpc,ncteisen/grpc,deepaklukose/grpc,Vizerai/grpc,thinkerou/grpc,thinkerou/grpc,ctiller/grpc,jtattermusch/grpc,yang-g/grpc,sreecha/grpc,Vizerai/grpc,pszemus/grpc,PeterFaiman/ruby-grpc-minimal,donnadionne/grpc,stanley-cheung/grpc,adelez/grpc,deepaklukose/grpc,vjpai/grpc,zhimingxie/grpc,msmania/grpc,kpayson64/grpc,quizlet/grpc,vjpai/grpc,yang-g/grpc,ejona86/grpc,simonkuang/grpc,kskalski/grpc,mehrdada/grpc,zhimingxie/grpc,pszemus/grpc,dgquintas/grpc,firebase/grpc,yang-g/grpc,geffzhang/grpc,kpayson64/grpc,kpayson64/grpc,kumaralokgithub/grpc,Crevil/grpc,carl-mastrangelo/grpc,PeterFaiman/ruby-grpc-minimal,thinkerou/grpc,grpc/grpc,sreecha/grpc,donnadionne/grpc,chrisdunelm/grpc,muxi/grpc,kskalski/grpc,Vizerai/grpc,mehrdada/grpc,nicolasnoble/grpc,deepaklukose/grpc,thinkerou/grpc,geffzhang/grpc,Vizerai/grpc,donnadionne/grpc,carl-mastrangelo/grpc,Crevil/grpc,ctiller/grpc,ncteisen/grpc,pszemus/grpc,muxi/grpc,muxi/grpc,muxi/grpc,ctiller/grpc,muxi/grpc,ctiller/grpc,thinkerou/grpc,carl-mastrangelo/grpc,stanley-cheung/grpc,firebase/grpc,dgquintas/grpc,fuchsia-mirror/third_party-grpc,jtattermusch/grpc,sreecha/grpc,donnadionne/grpc,simonkuang/grpc,quizlet/grpc,ctiller/grpc,kumaralokgithub/grpc,ctiller/grpc,daniel-j-born/grpc,deepaklukose/grpc,ncteisen/grpc,geffzhang/grpc,murgatroid99/grpc,jboeuf/grpc,vjpai/grpc,donnadionne/grpc,jboeuf/grpc,grpc/grpc,murgatroid99/grpc,Vizerai/grpc,vjpai/grpc,jboeuf/grpc,Vizerai/grpc,carl-mastrangelo/grpc,dgquintas/grpc,chrisdunelm/grpc,chrisdunelm/grpc,geffzhang/grpc,msmania/grpc,Crevil/grpc,firebase/grpc,grpc/grpc,daniel-j-born/grpc,kskalski/grpc,pszemus/grpc,kumaralokgithub/grpc,yongni/grpc,dgquintas/grpc,quizlet/grpc,kumaralokgithub/grpc,stanley-cheung/grpc,firebase/grpc,ejona86/grpc