Enable proxy headers parsing for Neutron
Enable proxy headers parsing for Neutron

http_proxy_to_wsgi middleware was recently added to Neutron [1] and
in order to take it into use, we need to enable it via hiera.

[1] Ice9ee8f4e04050271d59858f92034c230325718b
Depends-On: I99bc9486fdd85857ce73c413e17400320bd6ec5b
Related-Bug: #1590608

Change-Id: I10c065e726f2708e09acfc04dac3cae34a534d23

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates