Updated from global requirements

Change-Id: I6ab372eddd2eafc789e4fc7e16f36d7b0f390f2b

Author: OpenStack Proposal Bot

test-requirements.txt

@@ -11,7 +11,7 @@ oslotest>=1.10.0 # Apache-2.0
 reno!=2.3.1,>=1.8.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 requests-mock>=1.1 # Apache-2.0
-sphinx!=1.6.1,>=1.5.1 # BSD
+sphinx>=1.6.2 # BSD
 stevedore>=1.20.0 # Apache-2.0
 os-client-config>=1.27.0 # Apache-2.0
 os-testr>=0.8.0 # Apache-2.0