With multinode Octavia setup self and octavia_generate_certs is
True, role fails with distributing certificates.
While correct approach would be to replace that with PKI role, right now
we just patching current approach, by ensuring that facts are set
for octavia_cert_setup_host so we could reliable gain them.
Change-Id: I0dc2488b9e8e33847c9a2646032ac5f926d09133
Closes-Bug: #1936646