Power of two chance (#314)

* fix validator script
* 1/2^30 that we fail due to random returning the same value

multinode-demo/validator.sh

@@ -18,4 +18,4 @@ export RUST_LOG=solana=info
 sudo sysctl -w net.core.rmem_max=26214400
 
 cargo run --release --features=cuda --bin solana-fullnode -- \
-    -l validator.json -v leader.json -b 9000 -d < genesis.log
+    -l validator.json -v leader.json < genesis.log

src/crdt.rs

@@ -922,7 +922,8 @@ mod tests {
         let thread = Crdt::gossip(obj, recycler, sender, exit.clone());
         let mut one = false;
         let mut two = false;
-        for _ in 0..5 {
+        for _ in 0..30 {
+            //50% chance each try that we get a repeat
             let mut rv = reader.recv_timeout(Duration::new(1, 0)).unwrap();
             while let Ok(mut more) = reader.try_recv() {
                 rv.append(&mut more);