APIv2 tests: usability: better test logging

test-apiv2 has two basic comparisons of returned JSON:
equality and likeness ('=' and '~'). When logging failures,
the test runner shows both actual and expected values. When
logging success, for '=' there's no need to show both actual
and expected. But for '~', it can be helpful (for verifying
test correctness) to show the actual returned value.

To be specific:

   old: ok ... .MemTotal~[0-9]\+
   new: ok ... .MemTotal ('33509068800') ~ [0-9]\+

   old: ok ... .[0].State~\(exited\|stopped\)
   new: ok ... .[0].State ('exited') ~ \(exited\|stopped\)

The main benefit is that a developer or end user can
easily see precisely what was returned; this can help
confirm that the test is working as intended, and/or
help fine-tune how the test is written.

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

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