add glance-registry to ha-able services

- add to service array in attributes
- do not update glance endpoint if glance-registry
ensure vrrp only created for services in attributes service hash
convert to array of roles
Merge branch 'master' of github.com:rcbops-cookbooks/openstack-ha
convert role string into roles array, and iterate to build realserver list
Merge pull request #6 from mancdaz/master

use array of roles rather than single string role