Tolerate more privilege degradation scenarios

There is some inconsistency in the way BMCs may balk at pursuing a privilege level beyond
the user requesting.  Add code to cope with two scenarios:
-RAKP2 returning 0xd
-set session privilege level returning 0x80 or 0x81

Change-Id: I500e5bbdf88b569b1f1c3f8476033be080770871