Respect the BUCK_REPOSITORY_DIRTY environment variable when determining whether the buck repo is dirty.
Respect the BUCK_REPOSITORY_DIRTY environment variable when determining whether the buck repo is dirty.

Summary:
Also, I was passing `buck.git_dirty` java env variable as a boolean, as opposed
to 0/1 as earlier.

Test Plan:
export BUCK_REPOSITORY_DIRTY=0
echo "\n\n" >> README.md
cd ~/fbandroid
buckd
ps -ef | grep java and verify that "-Dbuck.git_dirty" is set to 0

buckd --kill
unset BUCK_REPOSITORY_DIRTY
buckd
ps -ef | grep java and verify that "-Dbuck.git_dirty" is set to 1

davido/buck,lukw00/buck,illicitonion/buck,zhuxiaohao/buck,davido/buck,romanoid/buck,janicduplessis/buck,janicduplessis/buck,artiya4u/buck,mread/buck,hgl888/buck,illicitonion/buck,JoelMarcey/buck,romanoid/buck,LegNeato/buck,SeleniumHQ/buck,artiya4u/buck,zpao/buck,stuhood/buck,SeleniumHQ/buck,pwz3n0/buck,shybovycha/buck,grumpyjames/buck,vschs007/buck,liuyang-li/buck,grumpyjames/buck,raviagarwal7/buck,justinmuller/buck,1yvT0s/buck,Dominator008/buck,vschs007/buck,vschs007/buck,rmaz/buck,saleeh93/buck-cutom,SeleniumHQ/buck,tgummerer/buck,rhencke/buck,romanoid/buck,LegNeato/buck,nguyentruongtho/buck,grumpyjames/buck,Heart2009/buck,rowillia/buck,brettwooldridge/buck,rmaz/buck,k21/buck,raviagarwal7/buck,zhan-xiong/buck,Dominator008/buck,sdwilsh/buck,artiya4u/buck,dsyang/buck,vine/buck,bocon13/buck,mnuessler/buck,SeleniumHQ/buck,zpao/buck,zhan-xiong/buck,dsyang/buck,mikekap/buck,zhan-xiong/buck,clonetwin26/buck,ilya-klyuchnikov/buck,rmaz/buck,Heart2009/buck,hgl888/buck,darkforestzero/buck,dpursehouse/buck,bocon13/buck,Learn-Android-app/buck,rowillia/buck,mikekap/buck,rhencke/buck,grumpyjames/buck,sdwilsh/buck,dsyang/buck,daedric/buck,nguyentruongtho/buck,romanoid/buck,ilya-klyuchnikov/buck,marcinkwiatkowski/buck,Distrotech/buck,shybovycha/buck,facebook/buck,luiseduardohdbackup/buck,nguyentruongtho/buck,vschs007/buck,luiseduardohdbackup/buck,darkforestzero/buck,dsyang/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,vine/buck,k21/buck,zpao/buck,rmaz/buck,brettwooldridge/buck,dsyang/buck,davido/buck,zhan-xiong/buck,Dominator008/buck,illicitonion/buck,facebook/buck,pwz3n0/buck,vschs007/buck,OkBuilds/buck,1yvT0s/buck,rmaz/buck,mogers/buck,bocon13/buck,mogers/buck,neonichu/buck,neonichu/buck,romanoid/buck,justinmuller/buck,1yvT0s/buck,vine/buck,dpursehouse/buck,zhuxiaohao/buck,LegNeato/buck,shybovycha/buck,rowillia/buck,SeleniumHQ/buck,JoelMarcey/buck,Distrotech/buck,vine/buck,Distrotech/buck,mnuessler/buck,zpao/buck,rhencke/buck,pwz3n0/buck,zhan-xiong/buck,zhan-xiong/buck,Dominator008/buck,marcinkwiatkowski/buck,daedric/buck,illicitonion/buck,k21/buck,mread/buck,mogers/buck,sdwilsh/buck,Dominator008/buck,k21/buck,mogers/buck,raviagarwal7/buck,shs96c/buck,grumpyjames/buck,shs96c/buck,grumpyjames/buck,LegNeato/buck,hgl888/buck,Dominator008/buck,Distrotech/buck,illicitonion/buck,justinmuller/buck,marcinkwiatkowski/buck,lukw00/buck,darkforestzero/buck,Dominator008/buck,MarkRunWu/buck,JoelMarcey/buck,shs96c/buck,Learn-Android-app/buck,rmaz/buck,zhan-xiong/buck,darkforestzero/buck,liuyang-li/buck,shs96c/buck,dsyang/buck,kageiit/buck,daedric/buck,janicduplessis/buck,LegNeato/buck,kageiit/buck,dushmis/buck,bocon13/buck,siddhartharay007/buck,raviagarwal7/buck,artiya4u/buck,1yvT0s/buck,OkBuilds/buck,OkBuilds/buck,nguyentruongtho/buck,Distrotech/buck,stuhood/buck,shybovycha/buck,rowillia/buck,mogers/buck,raviagarwal7/buck,SeleniumHQ/buck,lukw00/buck,sdwilsh/buck,k21/buck,marcinkwiatkowski/buck,robbertvanginkel/buck,JoelMarcey/buck,daedric/buck,stuhood/buck,JoelMarcey/buck,ilya-klyuchnikov/buck,tgummerer/buck,Learn-Android-app/buck,dsyang/buck,mogers/buck,romanoid/buck,LegNeato/buck,Heart2009/buck,daedric/buck,dsyang/buck,luiseduardohdbackup/buck,mikekap/buck,saleeh93/buck-cutom,grumpyjames/buck,marcinkwiatkowski/buck,hgl888/buck,raviagarwal7/buck,mogers/buck,shybovycha/buck,vine/buck,Addepar/buck,daedric/buck,mread/buck,robbertvanginkel/buck,ilya-klyuchnikov/buck,bocon13/buck,hgl888/buck,tgummerer/buck,marcinkwiatkowski/buck,luiseduardohdbackup/buck,saleeh93/buck-cutom,romanoid/buck,JoelMarcey/buck,dushmis/buck,Dominator008/buck,facebook/buck,LegNeato/buck,facebook/buck,facebook/buck,k21/buck,shybovycha/buck,OkBuilds/buck,bocon13/buck,hgl888/buck,JoelMarcey/buck,luiseduardohdbackup/buck,dushmis/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,siddhartharay007/buck,tgummerer/buck,dushmis/buck,Addepar/buck,mnuessler/buck,1yvT0s/buck,robbertvanginkel/buck,rhencke/buck,mikekap/buck,dpursehouse/buck,stuhood/buck,mnuessler/buck,brettwooldridge/buck,zhan-xiong/buck,vine/buck,dsyang/buck,daedric/buck,liuyang-li/buck,liuyang-li/buck,darkforestzero/buck,LegNeato/buck,davido/buck,janicduplessis/buck,vine/buck,daedric/buck,clonetwin26/buck,artiya4u/buck,Learn-Android-app/buck,rowillia/buck,1yvT0s/buck,1yvT0s/buck,justinmuller/buck,MarkRunWu/buck,justinmuller/buck,Heart2009/buck,rowillia/buck,rowillia/buck,LegNeato/buck,brettwooldridge/buck,Heart2009/buck,artiya4u/buck,dsyang/buck,mread/buck,janicduplessis/buck,janicduplessis/buck,1yvT0s/buck,kageiit/buck,brettwooldridge/buck,janicduplessis/buck,Addepar/buck,shs96c/buck,davido/buck,darkforestzero/buck,mikekap/buck,zhan-xiong/buck,romanoid/buck,Dominator008/buck,mnuessler/buck,brettwooldridge/buck,janicduplessis/buck,sdwilsh/buck,mread/buck,shybovycha/buck,artiya4u/buck,OkBuilds/buck,pwz3n0/buck,SeleniumHQ/buck,sdwilsh/buck,Learn-Android-app/buck,zpao/buck,facebook/buck,lukw00/buck,LegNeato/buck,Heart2009/buck,raviagarwal7/buck,darkforestzero/buck,justinmuller/buck,bocon13/buck,Distrotech/buck,rhencke/buck,darkforestzero/buck,bocon13/buck,sdwilsh/buck,clonetwin26/buck,grumpyjames/buck,romanoid/buck,sdwilsh/buck,shs96c/buck,artiya4u/buck,Addepar/buck,robbertvanginkel/buck,kageiit/buck,lukw00/buck,neonichu/buck,SeleniumHQ/buck,marcinkwiatkowski/buck,janicduplessis/buck,justinmuller/buck,k21/buck,stuhood/buck,vschs007/buck,bocon13/buck,zpao/buck,artiya4u/buck,Dominator008/buck,janicduplessis/buck,facebook/buck,stuhood/buck,robbertvanginkel/buck,Learn-Android-app/buck,mikekap/buck,shs96c/buck,mogers/buck,davido/buck,pwz3n0/buck,luiseduardohdbackup/buck,JoelMarcey/buck,sdwilsh/buck,clonetwin26/buck,mread/buck,1yvT0s/buck,LegNeato/buck,illicitonion/buck,vschs007/buck,shybovycha/buck,tgummerer/buck,bocon13/buck,vschs007/buck,justinmuller/buck,nguyentruongtho/buck,clonetwin26/buck,raviagarwal7/buck,marcinkwiatkowski/buck,ilya-klyuchnikov/buck,shybovycha/buck,OkBuilds/buck,shybovycha/buck,clonetwin26/buck,Heart2009/buck,darkforestzero/buck,sdwilsh/buck,justinmuller/buck,stuhood/buck,neonichu/buck,lukw00/buck,SeleniumHQ/buck,rmaz/buck,justinmuller/buck,grumpyjames/buck,rhencke/buck,Addepar/buck,Addepar/buck,pwz3n0/buck,MarkRunWu/buck,zhan-xiong/buck,clonetwin26/buck,dsyang/buck,davido/buck,OkBuilds/buck,saleeh93/buck-cutom,rhencke/buck,Distrotech/buck,grumpyjames/buck,vine/buck,siddhartharay007/buck,hgl888/buck,zhuxiaohao/buck,marcinkwiatkowski/buck,dpursehouse/buck,liuyang-li/buck,clonetwin26/buck,liuyang-li/buck,marcinkwiatkowski/buck,k21/buck,liuyang-li/buck,vschs007/buck,robbertvanginkel/buck,JoelMarcey/buck,Addepar/buck,marcinkwiatkowski/buck,mnuessler/buck,rmaz/buck,Dominator008/buck,k21/buck,neonichu/buck,LegNeato/buck,Addepar/buck,stuhood/buck,mnuessler/buck,MarkRunWu/buck,OkBuilds/buck,clonetwin26/buck,JoelMarcey/buck,mikekap/buck,Addepar/buck,stuhood/buck,darkforestzero/buck,robbertvanginkel/buck,robbertvanginkel/buck,luiseduardohdbackup/buck,rmaz/buck,JoelMarcey/buck,brettwooldridge/buck,pwz3n0/buck,shs96c/buck,mikekap/buck,mogers/buck,siddhartharay007/buck,romanoid/buck,raviagarwal7/buck,rowillia/buck,dpursehouse/buck,vschs007/buck,zhuxiaohao/buck,tgummerer/buck,lukw00/buck,siddhartharay007/buck,kageiit/buck,dpursehouse/buck,Learn-Android-app/buck,Addepar/buck,darkforestzero/buck,rowillia/buck,janicduplessis/buck,ilya-klyuchnikov/buck,davido/buck,dsyang/buck,robbertvanginkel/buck,raviagarwal7/buck,Addepar/buck,sdwilsh/buck,illicitonion/buck,k21/buck,k21/buck,brettwooldridge/buck,dsyang/buck,dushmis/buck,marcinkwiatkowski/buck,tgummerer/buck,siddhartharay007/buck,Distrotech/buck,pwz3n0/buck,artiya4u/buck,clonetwin26/buck,ilya-klyuchnikov/buck,kageiit/buck,SeleniumHQ/buck,rhencke/buck,pwz3n0/buck,zhuxiaohao/buck,luiseduardohdbackup/buck,pwz3n0/buck,rmaz/buck,JoelMarcey/buck,neonichu/buck,siddhartharay007/buck,mogers/buck,shybovycha/buck,neonichu/buck,JoelMarcey/buck,rhencke/buck,ilya-klyuchnikov/buck,lukw00/buck,davido/buck,rmaz/buck,shs96c/buck,janicduplessis/buck,shybovycha/buck,raviagarwal7/buck,OkBuilds/buck,daedric/buck,robbertvanginkel/buck,clonetwin26/buck,davido/buck,Addepar/buck,raviagarwal7/buck,dushmis/buck,daedric/buck,tgummerer/buck,dushmis/buck,lukw00/buck,illicitonion/buck,illicitonion/buck,justinmuller/buck,darkforestzero/buck,romanoid/buck,davido/buck,bocon13/buck,SeleniumHQ/buck,justinmuller/buck,Learn-Android-app/buck,ilya-klyuchnikov/buck,vine/buck,stuhood/buck,liuyang-li/buck,luiseduardohdbackup/buck,OkBuilds/buck,hgl888/buck,rmaz/buck,daedric/buck,neonichu/buck,vschs007/buck,Heart2009/buck,shybovycha/buck,brettwooldridge/buck,tgummerer/buck,sdwilsh/buck,grumpyjames/buck,zhuxiaohao/buck,rhencke/buck,justinmuller/buck,pwz3n0/buck,kageiit/buck,shs96c/buck,daedric/buck,zhuxiaohao/buck,clonetwin26/buck,stuhood/buck,dushmis/buck,clonetwin26/buck,lukw00/buck,illicitonion/buck,artiya4u/buck,illicitonion/buck,OkBuilds/buck,OkBuilds/buck,dpursehouse/buck,marcinkwiatkowski/buck,MarkRunWu/buck,MarkRunWu/buck,k21/buck,shs96c/buck,SeleniumHQ/buck,dpursehouse/buck,darkforestzero/buck,romanoid/buck,Dominator008/buck,neonichu/buck,rhencke/buck,dushmis/buck,rmaz/buck,rowillia/buck,Distrotech/buck,Learn-Android-app/buck,tgummerer/buck,vine/buck,liuyang-li/buck,zhuxiaohao/buck,zhuxiaohao/buck,mikekap/buck,lukw00/buck,mikekap/buck,k21/buck,nguyentruongtho/buck,robbertvanginkel/buck,shs96c/buck,nguyentruongtho/buck,rowillia/buck,Heart2009/buck,MarkRunWu/buck,mikekap/buck,saleeh93/buck-cutom,romanoid/buck,rowillia/buck,Distrotech/buck,daedric/buck,shs96c/buck,liuyang-li/buck,zhan-xiong/buck,illicitonion/buck,mogers/buck,robbertvanginkel/buck,LegNeato/buck,vschs007/buck,mnuessler/buck,Addepar/buck,siddhartharay007/buck,siddhartharay007/buck,zhan-xiong/buck,Learn-Android-app/buck,brettwooldridge/buck,davido/buck,brettwooldridge/buck,SeleniumHQ/buck,bocon13/buck,sdwilsh/buck,mikekap/buck,vine/buck,mnuessler/buck,Learn-Android-app/buck,zhan-xiong/buck,OkBuilds/buck,ilya-klyuchnikov/buck,raviagarwal7/buck,hgl888/buck,robbertvanginkel/buck,MarkRunWu/buck,vschs007/buck,grumpyjames/buck,davido/buck,Distrotech/buck,saleeh93/buck-cutom,liuyang-li/buck,tgummerer/buck,ilya-klyuchnikov/buck,zpao/buck,illicitonion/buck,dushmis/buck