Updated openstack/openstack
Project: openstack/keystone  641381aec54ad93320c1d38b1d96a61dccc6c1b3

Update URLs for keystone federation configuration docs

Seems like the URLs for identity-api changed, and need to be
updated.

Change-Id: Icc42da0a0b3794da65b464d1232fef12e47bedc4
Closes-Bug: #1363917