Function getRandomKeySelector

fdbserver/workloads/WriteDuringRead.actor.cpp:727–731

	Key getRandomVersionStampKey() { return versionStampKeyForIndex(deterministicRandom()->randomInt(0, nodes)); }

	KeySelector getRandomKeySelector() {
		int scale = 1 << deterministicRandom()->randomInt(0, 14);
		return KeySelectorRef(
		    getRandomKey(), deterministicRandom()->random01() < 0.5, deterministicRandom()->randomInt(-scale, scale));
	}

	GetRangeLimits getRandomLimits() {
		int kind = deterministicRandom()->randomInt(0, 3);