Fix the auto-healing support

There was a mismatch between the handlers signature and expectation by
the discovery core.

confluent_server/confluent/discovery/core.py

@@ -579,7 +579,8 @@ def detected(info):
             break
     else:  # no nodehandler, ignore for now
         return
-    if not handler.adequate(info) and info.get('protocol', None):
+    if (handler and not handler.NodeHandler.adequate(info) and
+            info.get('protocol', None)):
         eventlet.spawn_after(10, info['protocol'].fix_info, info,
                              safe_detected)
         return

confluent_server/confluent/discovery/handlers/generic.py

@@ -40,7 +40,8 @@ class NodeHandler(object):
                 targsa = info['addresses'][0]
         self.ipaddr = targsa[0]
 
-    def adequate(self, info):
+    @classmethod
+    def adequate(cls, info):
         # Check if the referenced info is really enough, if false, a rescan
         # may occur against the target in a short while
         return True

confluent_server/confluent/discovery/handlers/xcc.py

@@ -23,7 +23,8 @@ import pyghmi.ipmi.oem.lenovo.imm as imm
 class NodeHandler(immhandler.NodeHandler):
     devname = 'XCC'
 
-    def adequate(self, info):
+    @classmethod
+    def adequate(cls, info):
         # We can sometimes receive a partially initialized SLP packet
         # This is not adequate for being satisfied
         return bool(info['attributes'])