Since most PRs are focused on a single storage provider,
the tests for other storage providers do not need to be
run. The CI will allow skipping tests for other storage
providers by specifying keywords in the PR description.
Similar to [skip ci], you can now specify [test storage-provider].
For example, [test ceph] will only trigger the test
suites for ceph and none of the other storage providers.
Signed-off-by: travisn <tnielsen@redhat.com>