Parameterize DISTRIBUTION and merge job templates

This is an attempt to merge job templates for v1a4_integration_tests so
that instead of having one template for ubuntu and one for centos, we
have a single template and use the distribution variable to render two
separate jobs (for ubuntu and centos respectively).

Change-Id: I0d9563f1f2d545f5aa32f1a9418df63314fa0b4a
3 files changed
tree: 0ba83b4aa2abd6b404eaf997944a7f04570547f2
  1. jjb/
  2. .gitignore
  3. .gitreview
  4. .yamllint
  5. tox.ini