Set GatewayClass status for ignored GatewayClasses

[sjberman]

Problem: It is expected that any GatewayClass that references our controller should have its status set properly, even if not used by our controller.

Solution: Both the provisioner and controller will now add Accepted status False and ObservedGeneration to any GatewayClass that references our controller but is not configured to be used by our controller.

Testing: Conformance test now passes. Controller will also properly set statuses when not using provisioner.

Closes #775

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[pleshakov]

@pleshakov let me know what you think of the change I pushed to handle this. Basically we delete the GC if the controller name doesn't equal our name. I know you're messing around with the code I altered, so not sure if there's a better solution for it.