Remove docutils pin

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

Add PYTHONHASHSEED to tox.ini so that testsuite passes.

Change-Id: I6ea61a3cc441dd1ca2ced7e2fd837a55b917f76d

test-requirements.txt

@@ -1,6 +1,5 @@
 hacking>=0.8.0,<0.9
 
-docutils==0.9.1
 nose
 mock>=1.0
 mox>=0.5.3

tox.ini

@@ -10,6 +10,7 @@ deps = -r{toxinidir}/test-requirements.txt
        -r{toxinidir}/requirements.txt
 setenv = VIRTUAL_ENV={envdir}
          EVENTLET_NO_GREENDNS=yes
+         PYTHONHASHSEED=0
 commands =
     python setup.py testr --slowest --testr-args="{posargs}"
 sitepackages = False