Remove 'APPEND:'

If possible, we wannt to stick to 'MERGE', since the handlers
are designed to make that
idempotent for repeat.

APPEND: would not be idempotent...

confluent_server/confluent/syncfiles.py

@@ -53,9 +53,7 @@ class SyncList(object):
             if not ent:
                 continue
             if ent[-1] == ':':
-                if ent == 'APPEND:':
-                    currmap = self.appendmap
-                elif ent == 'MERGE:':
+                if ent == 'MERGE:':
                     currmap = self.mergemap
                 else:
                     raise Exception(