Do not consider refusal of default creds fatal

During discovery, there's a chance that user/pass already set.
For now, do not fret over this and just silently fail to enable
enclosure manager.

confluent_server/confluent/discovery/handlers/xcc.py

@@ -32,7 +32,8 @@ class NodeHandler(immhandler.NodeHandler):
             ipmicmd = self._get_ipmicmd()
             ipmicmd.xraw_command(netfn=0x3a, command=0xf1, data=(1,))
         except pygexc.IpmiException as e:
-            if e.ipmicode != 193:
+            if (e.ipmicode != 193 and 'Unauthorized name' not in str(e) and
+                    'Incorrect password' not in str(e)):
                 # raise an issue if anything other than to be expected
                 raise
         #TODO: decide how to clean out if important