Updated from global requirements

Change-Id: Ia35e711f1916749b156a1344ffafb4391a7a5408

Author: OpenStack Proposal Bot

requirements.txt

@@ -17,4 +17,4 @@ python-keystoneclient!=1.8.0,!=2.1.0,>=1.6.0 # Apache-2.0
 python-novaclient!=2.33.0,>=2.29.0 # Apache-2.0
 python-cinderclient>=1.6.0 # Apache-2.0
 requests!=2.9.0,>=2.8.1 # Apache-2.0
-stevedore>=1.5.0 # Apache-2.0
+stevedore>=1.9.0 # Apache-2.0