Use UCA for keepalived by default
Use UCA for keepalived by default

This should have been done long ago. Currently, the ppa is used,
because it's more up to date than Ubuntu Cloud Archive. However,
ubuntu cloud archive is the default in other roles, so we should
stick to the same method.

Change-Id: If10b5bdee977a8479934afb905145336d1094faa
Closes-Bug: 1617387
stackforge/os-ansible-deployment,bunchc/openstack-ansible,cfarquhar/openstack-ansible,Logan2211/openstack-ansible,os-cloud/os-ansible-deployment,weezer/openstack-ansible,robb-romans/openstack-ansible,cfarquhar/openstack-ansible,bunchc/openstack-ansible,BjoernT/openstack-ansible,weezer/openstack-ansible,cloudnull/os-ansible-deployment,BjoernT/os-ansible-deployment,stackforge/os-ansible-deployment,yanyao/openstack-ansible,BjoernT/os-ansible-deployment,openstack/openstack-ansible,yanyao/openstack-ansible,cloudnull/os-ansible-deployment,os-cloud/os-ansible-deployment,BjoernT/openstack-ansible,openstack/openstack-ansible,BjoernT/os-ansible-deployment,robb-romans/openstack-ansible,Logan2211/openstack-ansible