Add help message to etc/sysconfig/etcdctl
Quick tip about how to source the variables defined inside of
the file to quickly have etcdctl work.
-# etcd common flags
+# etcd common flags required to use etcdctl
+#
+# These variables have to be exported if you want to use etcdctl for
+# debugging purposes (for example to use: `etcdctl cluster-health`).
+# Use the following command to make these variables visible to
+# etcdctl:
+# set -a; source /etc/sysconfig/etcdctl; set +a
+
ETCDCTL_ENDPOINT="https://{{ grains['caasp_fqdn'] }}:2379"
# etcd v2 style flags
