Method createPromise

bindings/java/JavaWorkload.cpp:421–428

	}

	jobject createPromise(GenericPromise<bool>&& promise) {
		auto p = std::make_unique<JavaPromise>(std::move(promise));
		auto clazz = getClass("com/apple/foundationdb/testing/Promise");
		auto res = env->NewObject(clazz, getMethod(clazz, "<init>", "(J)V"), reinterpret_cast<jlong>(p.get()));
		checkException();
		p.release();
		return res;
	}

	void shutdownWorkload(jobject workload, const std::string& workloadName) {
		auto clazz = getClass(workloadName.c_str());