This patch is the second of two required to implement the
octavia-ovn-provider driver for Octavia. A new var, octavia_ovn_enabled,
can be used to install the driver and configure Octavia accordingly.
This patch has also restructured the driver/plugin mechanism for the
os_octavia role to better mirror that of os_neutron and to make
future additions easier to implement.
It also uses neutron's method of certificate delivery for the ovn certs.
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/919599
Change-Id: Ic5963070f4f2504860ddf0829819ca2f301546b1
Signed-off-by: Matthew Thode <mthode@mthode.org>
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