flake8/pep8 should ignore *.egg in root directory

I have a directory httplib2-0.8_pywikibot1-py2.7.egg which is full of
lint errors. So get pep8 and flake8 to ignore any *.egg directory
present in the root directory.

Change-Id: Iecfcef29a0c90c1aac66d39a05044db17b708ea4