"filter-with" breaks during setup-app

[davidi]

If you have a "filter-with = egg:whatever" clause in your app, upon setup-app you get the error:

The section 'main' is not the application (probably a filter). You should add #section_name, where section_name is the section that configures your application

This appears to be because ConfigLoader?.get_context() doesn't set a distribution for the filter-app context. My solution (I'm not sure how correct this is) was to borrow the one from the main 'context' context.

[davidi]

loadwsgi.py patch