Fixing dnsdomain_get call in nova.network.manager

  db.dnsdomain_get() was being passed an availability
  zone instead of a domain.

fixes: bug #1190718

Change-Id: Ia8ccf6e84d4b181adaa3b0475e51e3897ac03bd2
Remove hostname param from XenApi after first boot

Removes hostname param from XenApi after first boot.
Hostname being present is causing PV tools to pick
old hostname and revert the hostname changes.

Fixes: bug #1203025
Change-Id: I48d8e43addb8d6cd84ad160cd52427d47a31ff69
Merge "Remove hostname param from XenApi after first boot"
Merge "Fixing dnsdomain_get call in nova.network.manager"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp