add some logs

Change-Id: I04d23c9446847dca944eeed77105f498b04cac0d

vitrage_tempest_tests/tests/api/topology/test_topology.py

@@ -53,6 +53,10 @@ class TestTopology(BaseTopologyTest):
         cli_graph = utils.run_vitrage_command(
             'vitrage topology show --all-tenants',
             self.conf)
+
+        LOG.info('api-graph=%(api)s cli-graph=%(cli)s', {'api': api_graph,
+                                                         'cli': cli_graph})
+
         self._compare_graphs(api_graph, cli_graph)
 
     @utils.tempest_logger

vitrage_tempest_tests/tests/utils.py

@@ -69,6 +69,10 @@ def run_vitrage_command(command, conf):
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
     stdout, stderr = p.communicate()
+    if stderr:
+        LOG.error('error from command %(command)s = %(error)s',
+                  {'error': stderr, 'command': full_command})
+
     return stdout