Remove docutils pin

This was added to work around bug 1091333.  A new sphinx has been
released and so this is no longer necessary.

Also update sphinx requirement with global requirements.

Change-Id: I9107884d964757a9154bdd1feb4ea6df4e9df43e
diff --git a/test-requirements.txt b/test-requirements.txt
index 5192de7..c68b2db 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,9 +1,8 @@
 hacking>=0.9.2,<0.10
 
 coverage>=3.6
-sphinx>=1.1.2,<1.2
+sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3
 sphinxcontrib-blockdiag>=0.5.5
-docutils==0.9.1
 discover
 fixtures>=0.3.14
 python-keystoneclient>=0.4.2