Since the beaker jobs are being run on xenial, we need a special nodeset
for it, otherwise beaker gives an error:
beaker-hostgenerator was not able to use this value as input.
Exiting with an Error.
We also want to install puppet from the Ubuntu repos rather than from
puppetlabs, since puppetlabs doesn't support puppet 3 for Xenial. For
centos we can keep the install process the same.
Also run django.setup() since django >=1.7 now requires it[1].
Finally, correct the cron check string in the spec tests.
[1] http://django.readthedocs.io/en/latest/releases/1.7.html#backwards-incompatible-changes-in-1-7
Change-Id: Ifd2244ae9dd212b2475f9cd6adb994bc058a4769
Depends-On: I02729bc2d49f10a37e9314632b229fbbe72d0b0b
17bff7d7b4