Add ssh configuration for minion
Add ssh configuration for minion

Currently once the install is complete, a user is locked out which isn't
ideal. Let's manage the ssh like we do for the undercloud as well.

Change-Id: Ia94a3b92355cb0bd24f133a22e3dc5977fcb5180
Closes-Bug: #1837942

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates