Add logging to Xcode symlink tree generation
Add logging to Xcode symlink tree generation

Summary:
  * Improve logging for header symlink tree regeneration logic in Xcode project
    generation.

Test Plan:
  * Run `buck project`, check the log output for added messages.

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