cirrus: minor cleanup and refactoring

...with the goal of (very soon) reusing this code, in #2947,
to run system tests in CI. This is the cleanest way I can
think of to do so without duplication or a large maintenance
burden.

Changes are:
 - replace references to 'ginkgo' with 'integration'. That
   target is already in Makefile, and is not only more
   readable, it's also more abstract. There is no reason
   for this level of code to know about ginkgo.
 - allow rootless_test.sh to accept an argument,
   that being the name of the test suite to run
   (default: integration). #2947 will enable 'system'.
 - allow integration_test.sh to serve multiple purposes,
   by checking its filename. #2947 will add a symlink,
   system_test.sh, which will then cascade down to
   invoke system tests.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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