`cert_client` minion `signing_policy` list for VNC CA cert is un-hardcoded

  * It needed because a service engineer is able to set arbitrary hostname for control nodes.
    It allows to set arbitrary hostname pattern where nova_novncproxy service placement.

Change-Id: I0f7188de505d7d212a9ad0649771f955bec59d12
Related-PROD: PROD-30917
(cherry picked from commit 888c07e08a68312727d1ca62122b6cd2ae7fcefd)
1 file changed