Updated openstack/openstack
Project: openstack/neutron  76ff7c840c78dfb5b53e6d86b7b932265c315b57
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Pin Sphinx to <1.2

1.2 was just released and has a bug that causes builds to fail with
the error:

  error: 'source_dir' must be a directory name (got `...doc/source`)

See: http://bugs.python.org/issue19570
and: https://bitbucket.org/birkenfeld/sphinx/pull-request/193/builddoc-shouldnt-fail-on-unicode-paths/diff

Change-Id: I0487b4eca8f2755b882689289e3cdf429729b1fb