Updated from global requirements

Change-Id: Iadee329dc9ee5bd3b12a040c732965da43895dc4

Author: OpenStack Proposal Bot

requirements.txt

@@ -7,7 +7,7 @@ six>=1.9.0
 Babel>=1.3
 cliff>=1.7.0  # Apache-2.0
 cliff-tablib>=1.0
-oslo.config>=1.6.0  # Apache-2.0
+oslo.config>=1.9.0  # Apache-2.0
 oslo.i18n>=1.3.0  # Apache-2.0
 oslo.utils>=1.2.0                       # Apache-2.0
 oslo.serialization>=1.2.0               # Apache-2.0