Remove monkey patching from that library

Monkey patching must by done in the
program entry point.
Fix wrong file name in header
Fix hasattr usage by using getattr instead
Fix typo
Fix docstrings

Fix first sentence on one line.
Remove useless space char.
Remove overriding of setUp() or tearDown() as useless
Replace assert by assertTrue
Create load_conf function to read config file

Avoiding trying to read configuration from a
relative path. Instead use an environment variable
or directly pass the configuration file path to
the SwiftRepo class.