[PATCH] Add diagnostic output to svnversion_tests.py (Take 2)

Ok,

I guess that - seeing the comments from Karl and cmpilato - the patch
should have adhered the following structure.

The first patch corrects my own calls (using exceptions instead of return
1's). The second also corrects the calls to already existing api's.

So, if you all agree this function can stay in svnversion_tests.py and does
not need to get moved to svntest/actions.py, then applying either patch
should add the diagnostic output.

Log for patch1:

[[[

  * subversion/tests/clients/cmdline/svnversion_tests.py
     Added run_and_verify_svnversion procedure to generate
     diagnostic output when a test fails

]]]

Log for patch2:
[[[

  * subversion/tests/clients/cmdline/svnversion_tests.py
     - Added run_and_verify_svnversion procedure to generate
       diagnostic output when a test fails
     - rely on run_and_verify_* api to raise exceptions, not checking
       return values anymore.
]]]

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