Explicitly set the support cipher suite for Ingress TLS using Traefik,
following Mozilla intermediate minus DES3:
https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28default.29
Move the Traefik configuration to a ConfigMap for more flexbility than
provided by command line arguments.
Change-Id: I5a5a95385c4143cce21c60073ae168336c4b2f27
Story: 2005326
Task: 30254