command: simplified checking of tag conflicts in config options
command: simplified checking of tag conflicts in config options

mbrukman/serf,dalehamel/serf,pmenglund/serf,pmenglund/serf,yonglehou/serf,samaitra/serf,minhkiller/serf,pmenglund/serf,dalehamel/serf,minhkiller/serf,curtiszimmerman/serf,mapuri/serf,jmptrader/serf,dalehamel/serf,dalehamel/serf,FollowMyDev/serf,patrickviet/serf,minhkiller/serf,pmenglund/serf,samaitra/serf,FollowMyDev/serf,curtiszimmerman/serf,yonglehou/serf,samaitra/serf,patrickviet/serf,yonglehou/serf,gnawhleinad/serf,mbrukman/serf,yonglehou/serf,curtiszimmerman/serf,samaitra/serf,dalehamel/serf,yonglehou/serf,jmptrader/serf,gnawhleinad/serf,jmptrader/serf,jmptrader/serf,hashicorp/serf,hashicorp/serf,mapuri/serf,gnawhleinad/serf,curtiszimmerman/serf,hashicorp/serf,minhkiller/serf,pmenglund/serf,FollowMyDev/serf,mbrukman/serf,samaitra/serf,gnawhleinad/serf,FollowMyDev/serf,curtiszimmerman/serf,dalehamel/serf,hashicorp/serf,FollowMyDev/serf,hashicorp/serf,mbrukman/serf,minhkiller/serf,samaitra/serf,mapuri/serf,gnawhleinad/serf,patrickviet/serf,mbrukman/serf,mapuri/serf,minhkiller/serf,curtiszimmerman/serf,mbrukman/serf,patrickviet/serf,pmenglund/serf,FollowMyDev/serf,jmptrader/serf,yonglehou/serf,mapuri/serf,patrickviet/serf,jmptrader/serf,gnawhleinad/serf,mapuri/serf,patrickviet/serf