update_etc_hosts: include the "service" hosts in the update

Services on the network need to have their hostnames added on the
clients, and adding the client hostnames on the servers should be
harmless.

Fixes: 1cf0800 ("gen_hosts: templates: include localhost in the all group")
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Daniel Gomez <da.gomez@samsung.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>

Author: jtlayton

playbooks/update_etc_hosts.yml

@@ -1,6 +1,6 @@
 ---
 - name: Update target /etc/hosts with all targets and disable cloud-init
-  hosts: baseline:dev
+  hosts: baseline:dev:service
   gather_facts: false
   roles:
     - role: update_etc_hosts