Since v5.7.0, libvirt requires that proper socket unit is used to
listen on tcp/tls, and the usage of --listen option is forbidden
by default[1].
This patch makes puppet-nova depend on socket units instead of listen
option, to avoid failure when systemd tries to start libvrit service.
[1] 3a6a725b8f
Change-Id: I902169f54ff723c8f35ce12a7909950f61b4b7c6
Closes-Bug: #1880619
(cherry picked from commit 87f2437bdc)
(cherry picked from commit 5dd7c20fa0)
9d933a3e31