Documentation improvements.
Documentation improvements.

The version changes in docker are needed to support named volumes
which are replacing data containers in our implementation. Docker
is no unblocked upstream for us thanks to our new kolla_docker
module so I removed the cap on that as well.

Change-Id: I847979b9f7c9e42a55273b5ee926a4aff19a7bec

openstack/kolla,limamauricio/mykolla,intel-onp/kolla,mrangana/kolla,dardelean/kolla-ansible,stackforge/kolla,rahulunair/kolla,toby82/kolla,nihilifer/kolla,limamauricio/mykolla,dardelean/kolla-ansible,tonyli71/kolla,tonyli71/kolla,mandre/kolla,stackforge/kolla,intel-onp/kolla,toby82/kolla,mandre/kolla,limamauricio/mykolla,toby82/kolla,coolsvap/kolla,negronjl/kolla,mrangana/kolla,GalenMa/kolla,GalenMa/kolla,mandre/kolla,rahulunair/kolla,coolsvap/kolla,negronjl/kolla,stackforge/kolla,dardelean/kolla-ansible,coolsvap/kolla,negronjl/kolla,openstack/kolla,nihilifer/kolla