move tag to job
Merge pull request #3015 from jpoimboe/dockerinit-libvirt-prereqs

dockerinit: drop capabilities
Merge pull request #3185 from vieux/job_tag

Move tag to job
dockerinit: set hostname

Set the hostname in dockerinit instead of with lxc utils.  libvirt-lxc
doesn't have a way to do this, so do it in a common place.
dockerinit: set IP address

Set the IP address in dockerinit instead of lxc utils, to prepare for
using libvirt-lxc.