[NTOS:CM] Remove orphaned KCBs of keys during normal hive unload

[NTOS:CM] Remove orphaned KCBs of keys during normal hive unload

A hive whose KCBs have a reference count of 0, meaning nobody is using these keys anymore, will not get removed from the cache table.
As a result during a normal hive unloading operation you will get orphaned KCBs which results in an unload failure.

This is wrong, because this is what a normal hive unloading is supposed to do. What it cannot do of course is that it cannot
scramble the references of opened keys by the users who use the Registry, as it is the job of force unloading mechanism to do that.

Also remove a misleading debug print. Force unloading works as intended by scrambling the references of keys and marking the KCB for deletion,
which is what how a force unload works. Namely Windows does exactly that.

CORE-10705