Updates to ceph-libvirt-dns

Mostly just changes to ceph-libvirt-dns. Sets up an upstart job after installing
the script. Mostly effeciency changes and to make use of pyparsing dhcp leases
parser. Also Added some stuff for Mira which does not have back access.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>