libvirt packages and services are ensured by 'nova' module. This module is only used to change the libvirt configuration.
libvirt_group is changed from 'libvirt' to 'libvirtd'
Included 0 in value comparison within template so that "" are not put with value.

Signed-off-by: salmank <salmank@plumgrid.com>
Merge branch 'salmankh-dev', remote-tracking branch 'origin'