Update the testing documentation with system tests.

[QazerLab]

I had some hard time figuring out why system tests do not run well on my machine. It torn out that some people (and distros) still use the legacy version of Bats, which is incompatible with Podman tests, because its last released version has a fatal flaw, rendering half of the tests red.

Updating the testing documentation with link to the correct Bats repository to provide some clue for occasional users of old Bats.

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[mheon]

/ok-to-test
/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mheon, QazerLab

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[mheon]

@edsantiago PTAL

[rhatdan]

LGTM
@TomSweeneyRedHat PTAL

[TomSweeneyRedHat]

This probably has a merge dance with #3377.
Changes LGTM, but want a head nod from @edsantiago

[QazerLab]

#3377 is merged, but there is no conflict, as it modifies different md file (test/system/README.md). I think it would be a good idea to merge stuff from current PR to the section added by #3377 and replace the same section in test/README.md with the link to test/system/README.md.

@edsantiago, @TomSweeneyRedHat, WDYT?

[rhatdan]

/lgtm