Only register dynamic pool options when running designate-manage

We only need to load this code path when converting an old designate
configuration (pre-mitaka) into a pools.yaml file.

Change-Id: Ia9587880ca2428c0b3af074f0cb2a873859685ec

designate/manage/pool.py

@@ -66,6 +66,11 @@ class PoolCommands(base.Commands):
                default='/etc/designate/pools.yaml')
     def export_from_config(self, file):
         self._startup()
+
+        # Avoid circular dependency imports
+        from designate import pool_manager
+        pool_manager.register_dynamic_pool_options()
+
         try:
             pools = self.central_api.find_pools(self.context)
         except messaging.exceptions.MessagingTimeout:

designate/utils.py

@@ -82,10 +82,6 @@ def read_config(prog, argv):
              default_config_files=config_files)
     config.set_defaults()
 
-    # Avoid circular dependency imports
-    from designate import pool_manager
-    pool_manager.register_dynamic_pool_options()
-
 
 def resource_string(*args):
     if len(args) == 0: