Updated from global requirements

Change-Id: I17ae521c6d9cf2c2cf73527929984aed5fe225ca

Author: OpenStack Proposal Bot

requirements.txt

@@ -4,7 +4,7 @@
 pbr>=1.6 # Apache-2.0
 six>=1.9.0 # MIT
 
-Babel>=1.3 # BSD
+Babel!=2.3.0,!=2.3.1,!=2.3.2,!=2.3.3,>=1.3 # BSD
 cliff!=1.16.0,!=1.17.0,>=1.15.0 # Apache-2.0
 keystoneauth1>=2.1.0 # Apache-2.0
 openstacksdk>=0.8.4 # Apache-2.0