Add parameter to apache_wsgi to allow overwrite
and/or add additional wsgi process options.
This possibility was added to openstacklib
with Change-Id: I41914ce3361988d5db1695f09d21209772fdf548
Change-Id: I9f4ca58129a21a61cffbe84ee542ab7e16d2bb19
(cherry picked from commit b9088700f5)