Method getNextPushLocation

fdbserver/DiskQueue.actor.cpp:1006–1009

		return lastCommittedSeq + sizeof(Page);
	}
	location getNextPushLocation() const override {
		ASSERT(initialized);
		return endLocation();
	}

	Future<Void> getError() const override { return rawQueue->getError(); }
	Future<Void> onClosed() const override { return rawQueue->onClosed(); }