Remove docutils-pin

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

The docutils-pin has been removed from all projects listed
in projects.txt.
The patches removing the pin have used the IDs
I99ae8f8be1aa19508af05f2f72dea89537478f2f and
I6ea61a3cc441dd1ca2ced7e2fd837a55b917f76d .

There are a some projects not listed in projects.txt that still have the
docutils-pin, patches for these are under review.

Change-Id: Ic3208d181c0bdb4521ee2b062d8414ef7ac33230
Co-Authored-By: James E. Blair <jeblair@hp.com>
Merge "Remove docutils-pin"