BIND 10 #2221: Add verbosity=2 as an argument when running Python unittests

[BIND 10 Development]

#2221: Add verbosity=2 as an argument when running Python unittests
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            Reporter:  muks          |                        Owner:  muks
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 In #2165, we had a case where Python test output was printed in the order
 in which the tests occurred in the file, but were run in a different
 order. I looked at the wrong testcase as the cause of later failures for
 some time.

 Currently the test names are not printed as they are run. Adding
 `verbosity=2` to the `unittests.main()` call should make these be printed.
 But this argument is available on Python 3.2+ only. So we should use a
 try/except block and make it verbose where it's available.

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Ticket URL: <http://bind10.isc.org/ticket/2221>
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