Fixing man page generation

The man page generation failed with sphinx v1.1.3
and docutils 0.10 and 0.11.

Adding docutils==0.9.1 to the test-requirements.txt
in order to solve this issue.

The docutils==0.9.1 is on the common OpenStack dependency list.

Several doc creation warning and error also fixed by this change.

Change-Id: Icb412876f5a989e6b8aa4886f2a246127a76521a