The octavia pacakge in Ubuntu/Debian does not install python3-redis
automatically and it should be additionally installed. Also the octavia
package in RDO is removing explicit dependency to python3-redis[1] so
the package needs to be additionally installed in RDO in the future.
[1] https://review.rdoproject.org/r/c/openstack/octavia-distgit/+/53067
Change-Id: Ie7ffa7e22848a3f888a1a553aa26f2e4171a191b