Verified dragonfly and qnx gid0 names

Added support for qnx and dragonfly gid0 group names, based on:

http://gitweb.dragonflybsd.org/dragonfly.git/blame/5707c30f1cb20f5dc91961f50f676e3c9ed7dae9:/etc/group

http://www.qnx.com/developers/docs/qnx_4.25_docs/qnx4/user_guide/accounts.html