When running javac, print out the number of errors and warnings.
When running javac, print out the number of errors and warnings.

Summary:
When trying to fix a java_library with a lot of errors, it is helpful
to see the error count as you go along so you can tell if you are making
progress or not.

Test Plan: Built a failing java_library and verify that the message appears.

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