Added log.py which includes a simple Logger class that wraps some
basic functions from the Python logging module. The log wrapper
simplifies setup and will accommodate thread synchronization in the
future.  Test::doRun now uses the new log facility.
NOTE: this changes the format of the 'test progress' previously
printed via stdout.

Added patterns.py which includes a Singleton class design pattern
to support the Logger class.  Future design patterns can be added
to this file.

Tested with Python 2.7 on Linux.  All should be compatible with
Windows and Mac and most earlier widely-used versions of Python.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Chad Versace <chad.versace@intel.com>