config: use sane default value for etcd data dir
config: use sane default value for etcd data dir

Change-Id: I8b24aec2bf0cc3653f987a4944b8ee4be1008416
Reviewed-on: https://softwarefactory-project.io/r/6131
Reviewed-by: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>
Tested-by: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>
Workflow: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>

lebauce/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,redhat-cip/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,redhat-cip/skydive,skydive-project/skydive,skydive-project/skydive,lebauce/skydive,redhat-cip/skydive,lebauce/skydive,lebauce/skydive,safchain/skydive,lebauce/skydive,safchain/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive