Address review comments

multinode-demo/leader.sh

@@ -6,13 +6,9 @@ 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 $1}')"
+IPADDR="$(ifconfig | awk '/inet (addr)?/ {print $2}' | cut -d: -f2 | grep -v '127.0.0.1')"
 
-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
+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