Rename fixtures directory to job_fixtures to prepare for adding view_fixtures
directory in the following commits.
Change-Id: Ic20997cae020b542ddc22bf444fa6b92fbcae064
Add project folder module. Jenkins folder could be made with project-type: folder
This requires Cloudbees folder plugin and python-jenkins folder update
(see: https://review.openstack.org/#/c/180185/)
Change-Id: I7e1c28c26a69ae6ca736cec88fcb957a716d8fad