Use correct name of oslo debugger script

As of oslotest 1.2.0 the oslo debugger script dropped the .sh
extension. This patch corrects the use the script name in tox.ini

Change-Id: If36e727332af82c8a45af7306f55753d72983623
Fixes aggressive use of translation hints

The oslo.i18n docs say not to use the hints if the message will
ultimately be user facing:
    http://docs.openstack.org/developer/oslo.i18n/guidelines.html

Change-Id: I7162bcb3dd23f5df2f1220ec531b2e40b2588ce2
Remove nonexistant param from docstring

Change-Id: Ie6744f0c1b7dfabc6c9a20fc8fb470e69dedaf3f
Merge "Remove nonexistant param from docstring"
Merge "Fixes aggressive use of translation hints"
Merge "Use correct name of oslo debugger script"