stable-1.15-2.1.0

stable-1.15-2.1.0, stable-1.16-2.1.0, stable-1.17-2.1.0

traefik
    fix the velero-minio entrypoint to inherit global ssl and proxy protocol configurations (#259, @jieyu)
elasticsearch
    default data nodes has been increased to 4 (#327, @alejandroEsc)
external-dns
    disable by default (#335, @GoelDeepak)