Fixes 'not in' operator usage

Fixes bug 1110150

Change-Id: I6c48553564b1809a7ae5de9f778d93dccbe157ae
Merge "Fixes 'not in' operator usage"
Use a doubled proxy-logging instead of each middleware handling it
differently (if at all)

Adding a swift.source to wsgi pre_auth funcs and all middleware that makes
subrequests to proxy server.

NOTE: This change will result in a change in the number of proxy logs made for
staticweb, formpost, tempurl, and any other middleware that performs sub
requests (including swauth and SOS).

Please see docs for details.

DocImpact

Change-Id: I80cf2806add1c3d34054147e2515944be340455b