pybind/mgr/balancer: define Plan.{dump,show}()

as they are called by the commands

Signed-off-by: Kefu Chai <kchai@redhat.com>

src/pybind/mgr/balancer/module.py

@@ -68,6 +68,13 @@ def __init__(self, name, mode, osdmap, pools):
         self.inc = osdmap.new_incremental()
         self.pg_status = {}
 
+    def dump(self) -> str:
+        return json.dumps(self.inc.dump(), indent=4, sort_keys=True)
+
+    def show(self) -> str:
+        return 'upmap plan'
+
+
 class MsPlan(Plan):
     """
     Plan with a preloaded MappingState member.
@@ -84,9 +91,6 @@ def final_state(self) -> MappingState:
                             self.initial.raw_pool_stats,
                             'plan %s final' % self.name)
 
-    def dump(self) -> str:
-        return json.dumps(self.inc.dump(), indent=4, sort_keys=True)
-
     def show(self) -> str:
         ls = []
         ls.append('# starting osdmap epoch %d' % self.initial.osdmap.get_epoch())