Allow IPv6 port binding to fail

Author: murgatroid99

Diff for: packages/grpc-js-xds/interop/xds-interop-server.ts

@@ -289,7 +289,12 @@ async function main() {
       case 'IPV6':
         await serverBindPromise(server, `[::1]:${argv.port}`, creds);
         for (const address of getIPv6Addresses()) {
-          await serverBindPromise(server, `${address}:${argv.port}`, creds);
+          try {
+            await serverBindPromise(server, `${address}:${argv.port}`, creds);
+          } catch (e) {
+            console.log((e as Error).message);
+            continue;
+          }
         }
         break;
       default: