Replace depricated tempest-lib with tempest.lib

Change-Id: Ia674f69f5e5b2a94f3aac5ed497a39e6b71816c0
diff --git a/ironic_tempest_plugin/common/waiters.py b/ironic_tempest_plugin/common/waiters.py
index 1a79150..a32cd61 100644
--- a/ironic_tempest_plugin/common/waiters.py
+++ b/ironic_tempest_plugin/common/waiters.py
@@ -15,8 +15,8 @@
 
 import time
 
-from tempest_lib.common.utils import misc as misc_utils
-from tempest_lib import exceptions as lib_exc
+from tempest.lib.common.utils import misc as misc_utils
+from tempest.lib import exceptions as lib_exc
 
 
 def wait_for_bm_node_status(client, node_id, attr, status):