Unregisters {@code handler} from the list of kernel event handlers.If {@code handler} hasn't been registered with{@link #registerKernelEventHandler(KernelEventHandler)} prior to callingthis method an {@link IllegalStateException} will be thrown.After a successful call to this method the {@code handler} will nolonger receive any kernel events.
@param handler the handler to receive events about different statesin the kernel lifecycle.
@return the handler passed in as the argument.
@throws IllegalStateException if {@code handler} wasn't registered priorto calling this method.
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