Add python-jobs to heat-templates

pep8, python26 and python27 are initially non-voting.

heat-templates has agent scripts written in python which now have
unit tests that require check jobs.

These scripts are in diskimage-builder elements, and the python
is not packaged or published.

The jobs will be made voting when they prove to be reliable.

Change-Id: If7ffa7d9b2eb2937b8dcdd73cad8adcdb3387505
Merge "Add python-jobs to heat-templates"