chore: Update openstack.common to get latest timeutils

This is a simple update to marconi/openstack/common in order
to pick up the optimized version of timeutils.utctime_ts()

Change-Id: Ic37e5f271fe89085317a96c47d18ddd426529b50

marconi/openstack/common/timeutils.py

@@ -21,6 +21,7 @@ Time related utilities and helper functions.
 
 import calendar
 import datetime
+import time
 
 import iso8601
 import six
@@ -90,6 +91,11 @@ def is_newer_than(after, seconds):
 
 def utcnow_ts():
     """Timestamp version of our utcnow function."""
+    if utcnow.override_time is None:
+        # NOTE(kgriffs): This is several times faster
+        # than going through calendar.timegm(...)
+        return int(time.time())
+
     return calendar.timegm(utcnow().timetuple())