debian: update upstart script to also use _serf/_serf user
debian: update upstart script to also use _serf/_serf user

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