uWSGI: strip .ini suffix from instance names

The Upstart instance name for uWSGI apps is derived from the basename of the
configuration file, which trims the path but not the extension. Make it trim
the extension as well.

Change-Id: Ia401ac5a97e0c2d7c56f648bc8a9bcd0113d5a04
Merge "uWSGI: strip .ini suffix from instance names" into production