Updated from global requirements

Change-Id: Ic821e01dc577048d56728a3a22c4a5320340b48b

test-requirements.txt

@@ -5,7 +5,7 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
 testtools>=1.4.0 # MIT
 # These are needed for docs generation
-openstackdocstheme>=1.11.0 # Apache-2.0
+openstackdocstheme>=1.16.0 # Apache-2.0
 sphinx>=1.6.2 # BSD
 
 coverage!=4.4,>=4.0 # Apache-2.0