Security update for etcd

This update for etcd fixes the following issues: Update to version 3.5.12: Security fixes: CVE-2018-16873: Fixed remote command execution in cmd/go bsc1118897 CVE-2018-16874: Fixed directory traversal in cmd/go bsc1118898 CVE-2018-16875: Fixed CPU denial of service in crypto/x509 bsc1118899...