1. Fix flavor list unit test python 3.3 compatibility issue.
    2. tox.ini: setup pep8 ignore and exclude list.
    3. tox.ini: add skipdist to reduce test run time.
    4. add pylintrc to customize pylint

Change-Id: I43a1e0c3243cc8c6b3aa1e1a7d43c837cc5fe7a8