Move ingress enabled detection to helper method

Provide an option to disable built-in ingress globally.

1. Local value gets most precedence, so helper first checks if that is set and return the value if so.
2. If local isn't set, global values gets next precedence. Helper checks if global value is set and return the value if so.
3. If both local and global values haven't been set, it means user has no preference, and we fall back to the default value of true.

Closes #302 (closed)