Plumb --wait-for-supermajority through scripts (#10611) (#10614)

(cherry picked from commit 348bf78cd1)

Co-authored-by: Trent Nelson <trent@solana.com>

multinode-demo/bootstrap-validator.sh

@@ -57,6 +57,9 @@ while [[ -n $1 ]]; do
     elif [[ $1 = --no-restart ]]; then
       no_restart=1
       shift
+    elif [[ $1 == --wait-for-supermajority ]]; then
+      args+=("$1" "$2")
+      shift 2
     else
       echo "Unknown argument: $1"
       $program --help