ZAPI-713 - allow ?fields= in listVms to also request state, zone_state, and last_modified.
ZAPI-713 - allow ?fields= in listVms to also request state, zone_state,
and last_modified.

joyent/sdc-vmapi,joyent/sdc-vmapi,misterdjules/sdc-vmapi,misterdjules/sdc-vmapi