When the Octavia plugin code was moved to the Neutron
repo it was put under an 'if is_plugin_enabled octavia'
check. Depending on the way a node is built, sometimes
the function doesn't seem to be defined, so remove it
since it's ok to always define it.
Change-Id: Ib8c7bac4d0111345f30b7d160fe9b4a8f2132106
Looks like this was initially missed on the OVN migration,
but after talking with Octavia, this setup should really
all live here since it's SDN-specific things that are
being configured.
Content basically copied from the octavia devstack/plugin.sh
script with some small modifications to support OVN.
Change-Id: Idb80cd164c6b41ca6636373696a9a1e7f19b5e62