Fix typo for docker run commant.

 Add space between registry and certs volumes

Change-Id: I69286b8aad4bf5131965dd3e5e1cd0ef2b370101
diff --git a/tcp_tests/managers/openstack_manager.py b/tcp_tests/managers/openstack_manager.py
index 249c30c..4fe3926 100644
--- a/tcp_tests/managers/openstack_manager.py
+++ b/tcp_tests/managers/openstack_manager.py
@@ -66,7 +66,7 @@
                    "-e TEMPEST_CONF={0} "
                    "-e SKIP_LIST=mcp_skip.list "
                    "-e SOURCE_FILE=keystonercv3  "
-                   "-v /root/:/home/rally {2}"
+                   "-v /root/:/home/rally {2} "
                    "-v /etc/ssl/certs/:/etc/ssl/certs/ >> image.output"
                    .format(conf_name, pattern, registry))
         LOG.info("Restart keepalived service before running tempest tests")