Update test_indefinite_freeze_attack.py

Minor edit to comment.
Disable console log messages enabled by the repository tool, which this unit tests needs.
Sleep for at least 1 minute before checking for an expired metadata error, and ensure the function supplied to self.assertraises() is a callable.
Minor edit to comment in test_indefinite_freeze_attack.py.
Merge pull request #196 from vladimir-v-diaz/develop

Edits to test_indefinite_freeze_attack.py