Pin docutils to 0.9.1, fix pep8 errors

Docutils 0.10 breaks manpage generation in sphinx 1.1.3. A fix to
sphinx has been merged, but not yet released (scheduled for dec
24-31). In the mean time, we should pin docutils to 0.9.1.

Also fixes new pep8 errors as reported by pep8 1.3.4.

Change-Id: Icedae7bf70c7feaf9f1631c3a2cc3bea67570956