Updated from global requirements

Change-Id: Ief1a2faf6b9f80c5c7f3946d820f89587d44f8aa

Author: OpenStack Proposal Bot

requirements.txt

@@ -10,7 +10,7 @@ keystoneauth1>=2.18.0 # Apache-2.0
 openstacksdk>=0.9.13 # Apache-2.0
 osc-lib>=1.2.0 # Apache-2.0
 oslo.i18n>=2.1.0 # Apache-2.0
-oslo.utils>=3.18.0 # Apache-2.0
+oslo.utils>=3.20.0 # Apache-2.0
 python-glanceclient>=2.5.0 # Apache-2.0
 python-keystoneclient>=3.8.0 # Apache-2.0
 python-novaclient>=7.1.0 # Apache-2.0