Prior to failover or graceful failover, we should verify expected state of the cluster before proceeding

Currently we do not check to see if it is safe to proceed with a graceful or hard failover immediately prior to executing any kind of failover.

Our expectations should be:
1) The nodes we know about are part of the cluster and marked as active via /pools/default/
2) There are 0 inactiveFailed nodes
3) There are 0 inactiveAdded nodes

This check should be performed immediately prior to any failover or graceful failover of a node as closely as possible. In the future, we will only do this on versions that do not have MB-61888.

If this checks fail, we should abort any upgrades and allow reconciliation to recover the cluster prior to continuing any upgrades.