update links in http-api to point to specs repo
update links in http-api to point to specs repo

the links in the http-api docs were pointing to openstack-attic,
correct this by pointing to specs.o.org

Change-Id: I807f16b130548e90d975156a8488c66f3e4d59fc

openstack/keystone,ilay09/keystone,takeshineshiro/keystone,jonnary/keystone,mahak/keystone,rajalokan/keystone,klmitch/keystone,dims/keystone,takeshineshiro/keystone,ilay09/keystone,rajalokan/keystone,mahak/keystone,jamielennox/keystone,cernops/keystone,himanshu-setia/keystone,openstack/keystone,rajalokan/keystone,roopali8/keystone,maestro-hybrid-cloud/keystone,jamielennox/keystone,maestro-hybrid-cloud/keystone,mahak/keystone,ilay09/keystone,dims/keystone,himanshu-setia/keystone,ajayaa/keystone,openstack/keystone,idjaw/keystone,cernops/keystone,jonnary/keystone,idjaw/keystone,roopali8/keystone,klmitch/keystone,ajayaa/keystone