Double to single quotes and fix non python 2.6 compatible `format()` call using `{}` instead of `{0}`.
Make sure `salt.utils.jinja.SerializerExtension` calls it's parent class `__init__` method.
Call `self.environment` instead of `environment`.
Implement `SerializerExtension.parse()` to comply with pylint.
Merge pull request #6141 from s0undt3ch/hotfix/pylint-salt.utils.jinja

Fix pylint issues regarding `salt.utils.jinja`