Since it is used by multiple modules it makes sense
to make it a re-usable overlay. It also allows
it to be used optionally if that were ever to become
necessary.
Autodetect overlay-network-type in configure script
The openstack configure script currently defaults to
gre and if using e.g. vxlan you have to specify it.
We can easily glean the net type from Juju to try
that before defaulting to gre.
Update __OCTAVIA_RETROFIT_UCA__ for non UCA deployments
__OCTAVIA_RETROFIT_UCA__ is updated only for UCA release deployments.
And the function get_uca_release returns nothing if release is not
mentioned in generate_bundle.
New function get_ost_release introduced that returns the release name
specified as option for generate_bundle. If release option is not
specified, the release for corresponding series is returned. This
ensures param __OCTAVIA_RETROFIT_UCA__ is updated properly.