RBD unit tests: Set cfg.rados_connect_timeout

Unit test jobs occasionally fail because this option
is not set - always set it in the cfg initialization
to match the options used in the driver.

Change-Id: I29a3df4e1f50cbfbaf6758953eb350f00f447704
Signed-off-by: Eric Harney <eharney@redhat.com>

cinder/tests/unit/volume/drivers/test_rbd.py

@@ -196,6 +196,7 @@ class RBDTestCase(test.TestCase):
         cfg.volume_backend_name = None
         cfg.volume_dd_blocksize = '1M'
         cfg.rbd_store_chunk_size = 4
+        cfg.rados_connect_timeout = -1
         cfg.rados_connection_retries = 3
         cfg.rados_connection_interval = 5
         cfg.backup_use_temp_snapshot = False