Support different classNames for assigning annotations to Ingresses (or drop the magic)

[gw0]

Currently, the className setting for Ingress contains magic to add annotations if it equals nginx, public, and traefic. The design is misleading, because one can install e.g. multiple nginx-ingress controllers each one under a different name. One would expect that annotations under .Values.ingress.annotations.nginx will be used for all of them.

Also noticed, that the MQ Ingress is missing base annotations.