Cleanup outdated documentation
Cleanup outdated documentation

Kolla implements a workaround for the referenced docker issue. There is
no need to document it, however still recommend installing a recent
kernel for better compatibility.

Change-Id: I06eaa0bb0980f0698202724f523ab08cb344418e

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