Providing the basic logging infrastructure in proliantutils.
It adds a new module log.py which encapsulates the registry of
loggers(per module) of proliantutils. NullHandler is set at the
top level logger. Added ddt(data driven tests) dependency to
test requirements to facilitate multiplication of test cases
with different data samples.
Change-Id: I2d0f24ae40bd1b71b883e4e5d4dff6409939afc0
Implements: blueprint enable-logging
57a40be4a1