Tag all nova packages

Some users wish to override the default package provider by their own.

Tag all packages with the 'openstack' and its corresponding
service name to allow mass resource attributes override using
resource collectors.

Change-Id: I3a8041be7b9fcb304d2cf0dbdd4a021cd8594c02
Closes-bug: #1391209
Update [neutron] section in nova.conf for Juno

Use new parameters for Juno like it's documented here:
http://docs.openstack.org/trunk/config-reference/content/nova-conf-changes-master.html

* Use [neutron] section
* Delete the neutron_prefix when needed

Closes-bug #1391099

Change-Id: Ib63a80ea28b5aa5c033df3ec503031a99f4824c9
Merge "Update [neutron] section in nova.conf for Juno"
Merge "Tag all nova packages"