Replace openstack_proxy_address with cluster_public_host

In addition to template changes https://gerrit.mcp.mirantis.com/29621

Change-Id: I1d469d46e4931dec809c3f74ebbb3a98dfdc06a1
Closes-bug: PROD-24645 (PROD-25495)
(cherry picked from commit 983e92f6dd43b01c4c7e96afa60315cd9a672f43)
4 files changed