Update stackforge/tuskar-ui-extras to run tests on the gate

This patch does two things for tuskar-ui-extras:
* removes the outdated upstream repository information
* enables running of the python test, pep8 jobs

Change-Id: Ie61321816d619ec396fd6ea0eaa4a595447eabb3
Merge "Update stackforge/tuskar-ui-extras to run tests on the gate"