message: [cluster_test] Bump liveness check for 1m
  Consensus has problem when it can hang for about ~30 seconds(https://github.com/libra/libra/issues/902)
  To unblock cluster test this commit temporary bumps liveness check to 60 seconds
diff: @@ -8,7 +8,7 @@ pub struct LivenessHealthCheck {
  last_committed: HashMap<String, LastCommitInfo>,
  }
  -const MAX_BEHIND: Duration = Duration::from_secs(15);
  +const MAX_BEHIND: Duration = Duration::from_secs(60);
  #[derive(Default)]
  struct LastCommitInfo {
  