Fix remaining mention of KLWT
Fix remaining mention of KLWT

I found an overlooked mention of "Keystone Lightweight Tokens" which
actually shipped under the name "Fernet tokens" in Kilo.

Change-Id: I5b72745ea2f103333a610977a19fed5335d1d93f

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