Previously ODL was restricted to only running on the first node in an
tripleO HA deployment. This patches enables clustering for ODL and
allows multiple ODL instances (minimum 3 for HA).
Partially-implements: blueprint opendaylight-ha
Change-Id: Ic9a955a1c2afc040b2f9c6fb86573c04a60f9f31
Signed-off-by: Tim Rozet <trozet@redhat.com>