Run multiple instances from same workspace

* Support running leader and validators from multiple machines
  using the same NFS mounted workspace.
* Changes to setup, leader and validator scripts

multinode-demo/leader.sh

@@ -6,5 +6,13 @@ export RUST_LOG=${RUST_LOG:-solana=info}
 set -x
 [[ $(uname) = Linux ]] && sudo sysctl -w net.core.rmem_max=26214400
 
+IPADDR="$(ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}')"
+
+if [ -z "$IPADDR" ]; then
+    IPADDR="$(ifconfig  | grep 'inet '| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $2}')"
+fi
+
+cp leader-$IPADDR.json leader.json
+
 cargo run --release --bin solana-fullnode -- \
       -l leader.json < genesis.log tx-*.log > tx-"$(date -u +%Y%m%d%k%M%S%N)".log