double_rollback.js should reliably wait for node 0 to complete rollback

double_rollback.js waits for node 0 to roll back using the following checks:

    jsTestLog("Wait for nodes 0 to roll back and both node 0 and 2 to catch up to node 1");

    waitForState(nodes[0], ReplSetTest.State.SECONDARY);

    waitForState(nodes[2], ReplSetTest.State.SECONDARY);

    rst.awaitReplication();

However, these checks are not reliable on 3.4 and 3.6. The first check can succeed because node 0 was in state SECONDARY prior to entering rollback. The awaitReplication() only checks liveNodes on 3.4 and 3.6, which may not include node 0 if the last call to isMaster failed due to the node closing connections when entering rollback. We require a more reliable way to wait for node 0 to complete rollback.