Remove requirement for ha_compact to have 3 controllers

Remove ha_compact constraint
Remove tests from declaring cluster mode and set ha_compact as default
Reverse order of multinode and ha_compact, ha_compact should become
 default in menus

This depricates multinode deployments following the logic that all
 ha deployments can now support single controllers.

Further commit will be needed to remove multinode when this is considered
 stable

Change-Id: I8a69897aecc450be4ec5c7b4d786ccc1c2fd93aa
Implements: blueprint single-controller-ha
Merge "Remove requirement for ha_compact to have 3 controllers"