Revert "Drop linux capabilities and rework users/groups"

roles/etcd/templates/etcd-rkt.service.j2

@@ -8,9 +8,6 @@ Restart=on-failure
 RestartSec=10s
 TimeoutStartSec=0
 LimitNOFILE=40000
-User=root
-Group={{ etcd_group_id }}
-SupplementaryGroups={{ etcd_cert_group_id }}
 
 ExecStart=/usr/bin/rkt run \
 --uuid-file-save=/var/run/etcd.uuid \
@@ -23,11 +20,6 @@ ExecStart=/usr/bin/rkt run \
 --set-env-file=/etc/etcd.env \
 --stage1-from-dir=stage1-fly.aci \
 {{ etcd_image_repo }}:{{ etcd_image_tag }} \
-{% for c in etcd_drop_cap %}
---caps-remove=CAP_{{ c.upper() }} \
-{% endfor %}
---memory={{ etcd_memory_limit }} --cpu={{ etcd_cpu_limit }} \
---user={{ etcd_user_id }} --group={{ etcd_group_id }} \
 --name={{ etcd_member_name | default("etcd") }}
 
 ExecStartPre=-/usr/bin/rkt rm --uuid-file=/var/run/etcd.uuid