Point roles docs bugs to openstack-ansible LP
Point roles docs bugs to openstack-ansible LP

Currently when clicking on the small bug in the roles'
docs, we land on openstack-manuals launchpad.

This should solve it.

Change-Id: I1f66cf25a364b8b62cd9505b1be26ff96f370262

openstack/openstack-ansible-pip_install,openstack/openstack-ansible-pip_install,os-cloud/openstack-ansible-pip_install,os-cloud/openstack-ansible-pip_install