Add tests for verifying postgresql image in a remote OpenShift cluster

[hhorak]

This adds a new make option make test-openshift-remote-cluster that runs test/run-openshift-remote-cluster and it runs the test within a remote OpenShift cluster. It requires oc command to exist and being logged in in a working cluster. The same functions are also added into run-openshift script, so those are tested during PR tests.

[hhorak]

[test-openshift]

[hhorak]

BTW this PR requires also a change in container-common-scripts: https://github.com/sclorg/container-common-scripts/pull/108/files

@praiskup @pkubatrh WDYT? I'd like to create a similar PR for other container images, but would like to see whether it is the correct way to do it first.

[praiskup]

Looks like just (a rather large) file movement, and adding one new test which is possible to run against local or remote OpenShift cluster. If I interpret that correctly, it sounds wise - we should move as many tests as possible into the "common" tests subset... LGTM.

[hhorak]

Yes, it is exactly that. We might move the rest or the functions as well, although I doubt they will "just work" on remote cluster as they are written now. It will probably need some more adjustments, that I did not try yet. Merging now, and a new issue reported to track the porting of rest of the tests as #311.

[praiskup]

thanks