Add 'application' to keystone.py for WSGI
Add 'application' to keystone.py for WSGI

This adds WSGI application to keystone/httpd/keystone.py, fixing
bug 1194494.

Change-Id: I921fe1332dc9dd25e917f02f583b5b597cf35c26

jumpstarter-io/keystone,jamielennox/keystone,dstanek/keystone,jonnary/keystone,rushiagr/keystone,citrix-openstack-build/keystone,promptworks/keystone,UTSA-ICS/keystone-kerberos,klmitch/keystone,openstack/keystone,roopali8/keystone,klmitch/keystone,townbull/keystone-dtrust,ntt-sic/keystone,cloudbau/keystone,openstack/keystone,nuxeh/keystone,dstanek/keystone,himanshu-setia/keystone,ntt-sic/keystone,takeshineshiro/keystone,citrix-openstack-build/keystone,MaheshIBM/keystone,ging/keystone,blueboxgroup/keystone,blueboxgroup/keystone,rajalokan/keystone,JioCloud/keystone,ajayaa/keystone,ging/keystone,rickerc/keystone_audit,jumpstarter-io/keystone,mahak/keystone,reeshupatel/demo,rajalokan/keystone,promptworks/keystone,rodrigods/keystone,jumpstarter-io/keystone,ilay09/keystone,dsiddharth/access-keys,himanshu-setia/keystone,ajayaa/keystone,mahak/keystone,cloudbau/keystone,roopali8/keystone,maestro-hybrid-cloud/keystone,jamielennox/keystone,cernops/keystone,cernops/keystone,dsiddharth/access-keys,jonnary/keystone,rodrigods/keystone,derekchiang/keystone,rickerc/keystone_audit,ilay09/keystone,townbull/keystone-dtrust,mahak/keystone,vivekdhayaal/keystone,openstack/keystone,ntt-sic/keystone,derekchiang/keystone,rushiagr/keystone,townbull/keystone-dtrust,dims/keystone,citrix-openstack-build/keystone,reeshupatel/demo,idjaw/keystone,nuxeh/keystone,derekchiang/keystone,vivekdhayaal/keystone,vivekdhayaal/keystone,UTSA-ICS/keystone-kerberos,cloudbau/keystone,nuxeh/keystone,maestro-hybrid-cloud/keystone,reeshupatel/demo,rushiagr/keystone,rickerc/keystone_audit,idjaw/keystone,JioCloud/keystone,promptworks/keystone,MaheshIBM/keystone,dstanek/keystone,rajalokan/keystone,takeshineshiro/keystone,dims/keystone,dsiddharth/access-keys,ilay09/keystone