Add consul agent to etcd cluster
Add consul agent to etcd cluster

Adding a consul agent to the existing etcd cluster so it can register
itself and it's nodes as a service and resolve itself as etcd.service.cf.internal

this domain is hard coded in [bosh_utils.sh.erb](https://github.com/cloudfoundry-incubator/etcd-release/blob/master/jobs/etcd/templates/etcd_bosh_utils.sh.erb)

alphagov/paas-cf,jimconner/paas-cf,jimconner/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,jimconner/paas-cf,jimconner/paas-cf,jimconner/paas-cf,jimconner/paas-cf,alphagov/paas-cf,alphagov/paas-cf,jimconner/paas-cf,alphagov/paas-cf,alphagov/paas-cf