ldap: Add connection management to LDAPClient

Reviewed-By: Petr Viktorin <pviktori@redhat.com>

ipaserver/plugins/ldap2.py

@@ -98,11 +98,14 @@ class ldap2(LDAPClient, CrudBackend):
         except AttributeError:
             return DN()
 
-    def _init_connection(self):
+    def _connect(self):
         # Connectible.conn is a proxy to thread-local storage;
         # do not set it
         pass
 
+    def _disconnect(self):
+        pass
+
     def __del__(self):
         if self.isconnected():
             self.disconnect()