Update trove to install guest image and datastores

Update the trove bits to actually upload the trove guest image to
glance, and create the datastore and datastore version objects that
are associated with the guest image ID.

Change-Id: I6c5c56b3fac981e91cdd7ed60079a5649b8dfea8
Add rhel7 as supported distro

rhel7 testing has been fairly stable with redhatci bot testing beta
and RC builds for some time.  Centos7 testing is now coming online
with the nightly builds.  Thus no need to require the unsupported flag
any more.

Change-Id: Iceab5c1d8b713f1f96b5751cf988fe060cfeff58
Merge "Add rhel7 as supported distro"
Comment fix - correct function names

Change-Id: Idecc6cd9bc255ab20d3bc8f4b3a3e7f248b585f0
Merge "Update trove to install guest image and datastores"
Merge commit 'refs/changes/83/86083/2' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch