Sync global requirements to pin sphinx to sphinx>=1.1.2,<1.2
Sync global requirements to pin sphinx to sphinx>=1.1.2,<1.2

Sync the global requirements to pin sphinx.  This addresses an issue
where Sphinx 1.2 is not building documents correctly and causing
check/gate to fail.

Change-Id: Iea62bf9f5a1a6b729ab2ddb6d0c6390a7dc9dca1

gaolichuang/neutron-fwaas,citrix-openstack-build/neutron-fwaas,dougwig/x-neutron-fwaas,openstack/neutron-fwaas,gaolichuang/neutron-fwaas,openstack/neutron-fwaas