Fail the exopackage test script if OS name is neither 'Darwin' nor 'Linux'.
Fail the exopackage test script if OS name is neither 'Darwin' nor 'Linux'.

Test Plan: Edit the script to call something other than `uname -s` and see the script fail.

janicduplessis/buck,ilya-klyuchnikov/buck,rmaz/buck,lukw00/buck,mikekap/buck,OkBuilds/buck,marcinkwiatkowski/buck,MarkRunWu/buck,JoelMarcey/buck,darkforestzero/buck,LegNeato/buck,clonetwin26/buck,kageiit/buck,sdwilsh/buck,OkBuilds/buck,grumpyjames/buck,darkforestzero/buck,neonichu/buck,pwz3n0/buck,SeleniumHQ/buck,brettwooldridge/buck,vschs007/buck,lukw00/buck,Dominator008/buck,siddhartharay007/buck,brettwooldridge/buck,artiya4u/buck,shs96c/buck,dushmis/buck,janicduplessis/buck,grumpyjames/buck,vine/buck,zhan-xiong/buck,dushmis/buck,grumpyjames/buck,SeleniumHQ/buck,Learn-Android-app/buck,daedric/buck,marcinkwiatkowski/buck,janicduplessis/buck,k21/buck,Learn-Android-app/buck,artiya4u/buck,raviagarwal7/buck,zhuxiaohao/buck,hgl888/buck,ilya-klyuchnikov/buck,rhencke/buck,Heart2009/buck,vine/buck,zpao/buck,Distrotech/buck,illicitonion/buck,Learn-Android-app/buck,stuhood/buck,OkBuilds/buck,grumpyjames/buck,mnuessler/buck,robbertvanginkel/buck,zhan-xiong/buck,Addepar/buck,grumpyjames/buck,k21/buck,OkBuilds/buck,siddhartharay007/buck,mikekap/buck,robbertvanginkel/buck,marcinkwiatkowski/buck,rmaz/buck,SeleniumHQ/buck,mikekap/buck,1yvT0s/buck,artiya4u/buck,justinmuller/buck,clonetwin26/buck,1yvT0s/buck,dsyang/buck,rmaz/buck,bocon13/buck,MarkRunWu/buck,neonichu/buck,Learn-Android-app/buck,Addepar/buck,nguyentruongtho/buck,nguyentruongtho/buck,ilya-klyuchnikov/buck,sdwilsh/buck,SeleniumHQ/buck,k21/buck,janicduplessis/buck,rmaz/buck,liuyang-li/buck,bocon13/buck,stuhood/buck,OkBuilds/buck,shs96c/buck,rmaz/buck,k21/buck,Distrotech/buck,k21/buck,raviagarwal7/buck,pwz3n0/buck,Addepar/buck,Addepar/buck,brettwooldridge/buck,pwz3n0/buck,brettwooldridge/buck,vschs007/buck,Learn-Android-app/buck,grumpyjames/buck,zpao/buck,zhan-xiong/buck,mnuessler/buck,SeleniumHQ/buck,justinmuller/buck,rowillia/buck,romanoid/buck,shs96c/buck,dpursehouse/buck,siddhartharay007/buck,sdwilsh/buck,mogers/buck,rowillia/buck,rhencke/buck,MarkRunWu/buck,Dominator008/buck,clonetwin26/buck,janicduplessis/buck,darkforestzero/buck,tgummerer/buck,clonetwin26/buck,Addepar/buck,bocon13/buck,vine/buck,MarkRunWu/buck,liuyang-li/buck,Learn-Android-app/buck,tgummerer/buck,LegNeato/buck,dsyang/buck,Heart2009/buck,LegNeato/buck,Heart2009/buck,justinmuller/buck,sdwilsh/buck,zpao/buck,Heart2009/buck,mogers/buck,rhencke/buck,shybovycha/buck,darkforestzero/buck,robbertvanginkel/buck,illicitonion/buck,zhuxiaohao/buck,facebook/buck,robbertvanginkel/buck,Addepar/buck,mogers/buck,davido/buck,vschs007/buck,SeleniumHQ/buck,grumpyjames/buck,dushmis/buck,Dominator008/buck,justinmuller/buck,stuhood/buck,bocon13/buck,dsyang/buck,rmaz/buck,dsyang/buck,illicitonion/buck,dpursehouse/buck,zpao/buck,shs96c/buck,mogers/buck,luiseduardohdbackup/buck,stuhood/buck,JoelMarcey/buck,vschs007/buck,Heart2009/buck,vine/buck,JoelMarcey/buck,shybovycha/buck,1yvT0s/buck,brettwooldridge/buck,neonichu/buck,SeleniumHQ/buck,LegNeato/buck,facebook/buck,Learn-Android-app/buck,JoelMarcey/buck,Distrotech/buck,marcinkwiatkowski/buck,rmaz/buck,siddhartharay007/buck,shybovycha/buck,marcinkwiatkowski/buck,bocon13/buck,artiya4u/buck,clonetwin26/buck,OkBuilds/buck,pwz3n0/buck,Learn-Android-app/buck,daedric/buck,hgl888/buck,rowillia/buck,mogers/buck,sdwilsh/buck,zhan-xiong/buck,liuyang-li/buck,marcinkwiatkowski/buck,bocon13/buck,lukw00/buck,OkBuilds/buck,mogers/buck,vine/buck,dushmis/buck,mogers/buck,dsyang/buck,k21/buck,zhuxiaohao/buck,raviagarwal7/buck,pwz3n0/buck,darkforestzero/buck,luiseduardohdbackup/buck,dsyang/buck,rowillia/buck,janicduplessis/buck,sdwilsh/buck,vschs007/buck,shybovycha/buck,1yvT0s/buck,neonichu/buck,JoelMarcey/buck,dushmis/buck,dushmis/buck,Addepar/buck,SeleniumHQ/buck,SeleniumHQ/buck,daedric/buck,OkBuilds/buck,rmaz/buck,justinmuller/buck,1yvT0s/buck,grumpyjames/buck,ilya-klyuchnikov/buck,raviagarwal7/buck,liuyang-li/buck,Addepar/buck,LegNeato/buck,dpursehouse/buck,brettwooldridge/buck,facebook/buck,darkforestzero/buck,LegNeato/buck,1yvT0s/buck,zhuxiaohao/buck,LegNeato/buck,janicduplessis/buck,Distrotech/buck,marcinkwiatkowski/buck,rhencke/buck,raviagarwal7/buck,zhan-xiong/buck,JoelMarcey/buck,JoelMarcey/buck,vine/buck,Dominator008/buck,bocon13/buck,janicduplessis/buck,daedric/buck,janicduplessis/buck,MarkRunWu/buck,kageiit/buck,siddhartharay007/buck,dsyang/buck,liuyang-li/buck,luiseduardohdbackup/buck,rhencke/buck,brettwooldridge/buck,kageiit/buck,mikekap/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,marcinkwiatkowski/buck,artiya4u/buck,1yvT0s/buck,shs96c/buck,k21/buck,vschs007/buck,rhencke/buck,pwz3n0/buck,siddhartharay007/buck,shs96c/buck,vschs007/buck,rowillia/buck,liuyang-li/buck,ilya-klyuchnikov/buck,daedric/buck,illicitonion/buck,shs96c/buck,clonetwin26/buck,daedric/buck,sdwilsh/buck,clonetwin26/buck,justinmuller/buck,hgl888/buck,dsyang/buck,darkforestzero/buck,romanoid/buck,mogers/buck,artiya4u/buck,nguyentruongtho/buck,shybovycha/buck,mnuessler/buck,daedric/buck,bocon13/buck,LegNeato/buck,shs96c/buck,SeleniumHQ/buck,stuhood/buck,davido/buck,ilya-klyuchnikov/buck,luiseduardohdbackup/buck,davido/buck,davido/buck,Dominator008/buck,davido/buck,rmaz/buck,JoelMarcey/buck,mikekap/buck,illicitonion/buck,mikekap/buck,davido/buck,mogers/buck,Learn-Android-app/buck,JoelMarcey/buck,zhuxiaohao/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,Heart2009/buck,lukw00/buck,justinmuller/buck,lukw00/buck,robbertvanginkel/buck,zhan-xiong/buck,mikekap/buck,zhan-xiong/buck,illicitonion/buck,rowillia/buck,illicitonion/buck,rhencke/buck,lukw00/buck,OkBuilds/buck,robbertvanginkel/buck,siddhartharay007/buck,sdwilsh/buck,dushmis/buck,hgl888/buck,1yvT0s/buck,illicitonion/buck,raviagarwal7/buck,shybovycha/buck,hgl888/buck,OkBuilds/buck,vine/buck,clonetwin26/buck,OkBuilds/buck,daedric/buck,1yvT0s/buck,OkBuilds/buck,tgummerer/buck,raviagarwal7/buck,luiseduardohdbackup/buck,rowillia/buck,romanoid/buck,lukw00/buck,raviagarwal7/buck,romanoid/buck,Distrotech/buck,daedric/buck,neonichu/buck,Heart2009/buck,stuhood/buck,illicitonion/buck,shs96c/buck,Heart2009/buck,neonichu/buck,zpao/buck,nguyentruongtho/buck,JoelMarcey/buck,dushmis/buck,vine/buck,pwz3n0/buck,mikekap/buck,tgummerer/buck,illicitonion/buck,robbertvanginkel/buck,rmaz/buck,facebook/buck,mogers/buck,liuyang-li/buck,ilya-klyuchnikov/buck,rmaz/buck,daedric/buck,romanoid/buck,LegNeato/buck,romanoid/buck,clonetwin26/buck,rhencke/buck,brettwooldridge/buck,k21/buck,pwz3n0/buck,Dominator008/buck,sdwilsh/buck,shybovycha/buck,zhuxiaohao/buck,vschs007/buck,sdwilsh/buck,zhan-xiong/buck,sdwilsh/buck,clonetwin26/buck,Learn-Android-app/buck,romanoid/buck,artiya4u/buck,shs96c/buck,robbertvanginkel/buck,dsyang/buck,neonichu/buck,hgl888/buck,vschs007/buck,vine/buck,shybovycha/buck,stuhood/buck,MarkRunWu/buck,hgl888/buck,tgummerer/buck,grumpyjames/buck,Distrotech/buck,tgummerer/buck,Addepar/buck,rowillia/buck,kageiit/buck,nguyentruongtho/buck,grumpyjames/buck,neonichu/buck,davido/buck,grumpyjames/buck,Dominator008/buck,marcinkwiatkowski/buck,vschs007/buck,darkforestzero/buck,illicitonion/buck,rmaz/buck,facebook/buck,dsyang/buck,bocon13/buck,artiya4u/buck,mnuessler/buck,lukw00/buck,darkforestzero/buck,mnuessler/buck,clonetwin26/buck,artiya4u/buck,zhan-xiong/buck,dsyang/buck,vschs007/buck,bocon13/buck,rhencke/buck,pwz3n0/buck,facebook/buck,vschs007/buck,stuhood/buck,vine/buck,luiseduardohdbackup/buck,artiya4u/buck,Addepar/buck,darkforestzero/buck,ilya-klyuchnikov/buck,Dominator008/buck,MarkRunWu/buck,stuhood/buck,dsyang/buck,justinmuller/buck,Distrotech/buck,Distrotech/buck,luiseduardohdbackup/buck,JoelMarcey/buck,mnuessler/buck,luiseduardohdbackup/buck,marcinkwiatkowski/buck,SeleniumHQ/buck,mogers/buck,rowillia/buck,robbertvanginkel/buck,justinmuller/buck,vschs007/buck,LegNeato/buck,liuyang-li/buck,marcinkwiatkowski/buck,mnuessler/buck,raviagarwal7/buck,rowillia/buck,Distrotech/buck,MarkRunWu/buck,luiseduardohdbackup/buck,LegNeato/buck,pwz3n0/buck,justinmuller/buck,Heart2009/buck,romanoid/buck,tgummerer/buck,zpao/buck,SeleniumHQ/buck,facebook/buck,marcinkwiatkowski/buck,justinmuller/buck,vine/buck,raviagarwal7/buck,zhan-xiong/buck,mikekap/buck,marcinkwiatkowski/buck,OkBuilds/buck,zhan-xiong/buck,dpursehouse/buck,shs96c/buck,tgummerer/buck,darkforestzero/buck,kageiit/buck,Dominator008/buck,zhuxiaohao/buck,rmaz/buck,romanoid/buck,darkforestzero/buck,SeleniumHQ/buck,lukw00/buck,k21/buck,shybovycha/buck,davido/buck,janicduplessis/buck,dpursehouse/buck,mikekap/buck,Dominator008/buck,romanoid/buck,romanoid/buck,shybovycha/buck,sdwilsh/buck,robbertvanginkel/buck,davido/buck,Dominator008/buck,Distrotech/buck,daedric/buck,raviagarwal7/buck,k21/buck,raviagarwal7/buck,brettwooldridge/buck,dpursehouse/buck,k21/buck,mikekap/buck,JoelMarcey/buck,lukw00/buck,tgummerer/buck,mnuessler/buck,liuyang-li/buck,liuyang-li/buck,kageiit/buck,justinmuller/buck,zhuxiaohao/buck,nguyentruongtho/buck,liuyang-li/buck,siddhartharay007/buck,Addepar/buck,shybovycha/buck,tgummerer/buck,sdwilsh/buck,justinmuller/buck,LegNeato/buck,robbertvanginkel/buck,shs96c/buck,robbertvanginkel/buck,hgl888/buck,ilya-klyuchnikov/buck,rhencke/buck,zhan-xiong/buck,stuhood/buck,raviagarwal7/buck,pwz3n0/buck,janicduplessis/buck,clonetwin26/buck,daedric/buck,siddhartharay007/buck,davido/buck,illicitonion/buck,romanoid/buck,davido/buck,ilya-klyuchnikov/buck,Dominator008/buck,zhan-xiong/buck,daedric/buck,rowillia/buck,janicduplessis/buck,dsyang/buck,Addepar/buck,robbertvanginkel/buck,brettwooldridge/buck,k21/buck,brettwooldridge/buck,Learn-Android-app/buck,dushmis/buck,clonetwin26/buck,shybovycha/buck,dpursehouse/buck,rhencke/buck,zpao/buck,ilya-klyuchnikov/buck,neonichu/buck,rowillia/buck,dpursehouse/buck,stuhood/buck,mnuessler/buck,shs96c/buck,nguyentruongtho/buck,grumpyjames/buck,davido/buck,zhuxiaohao/buck,LegNeato/buck,artiya4u/buck,tgummerer/buck,JoelMarcey/buck,hgl888/buck,romanoid/buck,Distrotech/buck,illicitonion/buck,k21/buck,shybovycha/buck,kageiit/buck,bocon13/buck,mikekap/buck,darkforestzero/buck,bocon13/buck,lukw00/buck,davido/buck,dushmis/buck,Addepar/buck