Update .gitignore to ignore out logs
Update .gitignore to ignore out logs

When you have running tox -elint, it's will generate logs dir in the
project, It's useful to add logs in .gitignore to avoid logs to be
commited. And, when you have using pycharm to open this project, it's
will generate a hide dir .idea, so it's also needed to be ignore

Change-Id: Ia86897b5971703cb83c8b32d502ce955b8419ac0

openstack/rpm-packaging,openstack/rpm-packaging