* helm: add new ingressClass resource
* add ingress parameters support
This commit adds ingress parameters support.
Credits go to Ariel Vinas: ariel@craftech.io
When deploying the controller to a custom namespace, users have to
overwrite the namespace attribute as well as the hardcoded namespace
values in a number of args for the Deployment and the admission
controller Jobs.
Instead, this commit, uses the namespace name from the DownwardAPI,
and allows users to simply change the namespace attribute without
having to worry about the container args.
