Use external address in openrc-example
Use external address in openrc-example

This is mostly a docs change.  The external address should be used
rather than the internal address when sourcing openrc-example.
The internal address may not be accessible from outside the VIP
interface.

Change-Id: I10ac0c116227af9c4409a050203e2a28e3a116a2
rajalokan/kolla,dardelean/kolla-ansible,nihilifer/kolla,limamauricio/mykolla,negronjl/kolla,fdumpling/kolla,mrangana/kolla,limamauricio/mykolla,toby82/kolla,coolsvap/kolla,toby82/kolla,tonyli71/kolla,dardelean/kolla-ansible,mandre/kolla,chenzhiwei/kolla,coolsvap/kolla,intel-onp/kolla,negronjl/kolla,rahulunair/kolla,rajalokan/kolla,stackforge/kolla,fdumpling/kolla,intel-onp/kolla,limamauricio/mykolla,fdumpling/kolla,nihilifer/kolla,GalenMa/kolla,dardelean/kolla-ansible,chenzhiwei/kolla,mandre/kolla,coolsvap/kolla,mrangana/kolla,openstack/kolla,GalenMa/kolla,stackforge/kolla,chenzhiwei/kolla,negronjl/kolla,toby82/kolla,rahulunair/kolla,openstack/kolla,rajalokan/kolla,tonyli71/kolla,stackforge/kolla,mandre/kolla