Do not fail if a pipeline is pending

gitlab_docker_autodep/deps.py

 import gitlab
 import logging
 import re
+import time
 
 
 _from_rx = re.compile(r'^FROM\s+(.*)$')
@@ -92,9 +93,9 @@ def rebuild_deps(gitlab_url, registry_hostname, gitlab_token,
         logging.info('rebuilding %s', project.path_with_namespace)
         if not dry_run:
             pipeline = rebuild(project, wait)
-            if pipeline.status != 'success':
-                logging.error('ERROR: build failed for %s',
-                              project.path_with_namespace)
+            if pipeline.status not in ('success', 'pending'):
+                logging.error('ERROR: build failed for %s (%s)',
+                              project.path_with_namespace, pipeline)
                 return
 
         if recurse: