TOOLS-1264/TOOLS-563: Moved "do_avail" to its own file. Added "sdcadm experimental avail" which includes vm, cn and net agents
TOOLS-1264/TOOLS-563: Moved "do_avail" to its own file. Added "sdcadm experimental avail" which includes vm, cn and net agents

joyent/sdcadm,joyent/sdcadm,joyent/sdcadm