Fallback to older eventlet signature
Fallback to older eventlet signature

Older eventlet did not understand some arguments
on wsgi.  Fallback to not using those arguments
if unavailable.

xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,whowutwut/confluent,whowutwut/confluent,jjohnson42/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,whowutwut/confluent,whowutwut/confluent