Due the fact that one release might have different installers and
recently we were facing problems where add a test on the skiplist in
upstream jobs was also affecting downstream jobs, the best solution
right now is to add the key installers on the release for the test.
The default remains being 'tripleo' and 'osp', so we don't need to edit
all the tests to add the installers option. However, if you explicitly
set the installer, and you want it to be skipped in both tripleo and
other, you must also add the tripleo to the list.
Change-Id: I709a826f75e64ab2a7f741891e0a3cc4aa6edf32
85a392c55f