Add waiter for object creation

Fixes out-of-sync object quota cache for ceph

Closes-Bug: #1967567
Change-Id: I39d0dcc6e629f278fdff718980b376d392e30084
diff --git a/tempest/config.py b/tempest/config.py
index 92fb31b..39e7fb3 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -1148,6 +1148,9 @@
                help="One name of cluster which is set in the realm whose name "
                     "is set in 'realm_name' item in this file. Set the "
                     "same cluster name as Swift's container-sync-realms.conf"),
+    cfg.IntOpt('build_timeout',
+               default=10,
+               help="Timeout in seconds to wait for objects to create."),
 ]
 
 object_storage_feature_group = cfg.OptGroup(