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.

We also had to adjust the pip command used.

Change-Id: I8894c0199db845e90e5086a7c0e6bb7c7a26b5a0