Really ensure that sphinx <1.2 is installed

Because sphinx have release on pypi version suffixed by a letter for beta
purpose, ie: 1.2b3, even <1.2 is in requirement.txt 1.2b3 is installed.

This changes force the upper version to 1.1.999, to not install beta version
of sphinx 1.2.

Change-Id: I951951ce24388cc1c7a9e472daf58a1e12124aba
Closes-bug: #1346827