Adding a helper client for MySQL will enable int-tests
involving actual data operations.
The test_helper.py file was also modified to push
more boiler-plate code into the base class, as it has
become apparent that only one 'add' 'remove' and 'verify'
method is probably adecuate for most datastores (given
the right sane parameters). The Redis helper was also
cleaned up to use the new format.
Change-Id: Iff34ca0b922adc9eea8b3861b05adf0251109221
Co-Authored-By: Petr Malik <pmalik@tesora.com>
Co-Authored-By: Peter Stachowski <peter@tesora.com>
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