Bug#35306351 ndb_restore can exit with code 1 without any error messages if it fails to connect to cluster

The ndb_restore command can exit with code 1 without any error messages if it fails to connect to the cluster due to no free slots etc. This is a very unkind behavior. Fix by add some error messages like "Connection to cluster failed" before exit. Change-Id: I0c65751b11feeb7ea48009159c48141a35baad32

Author: blaudden

storage/ndb/tools/restore/restore_main.cpp

@@ -1923,6 +1923,9 @@ static void init_restore()
  if (g_cluster_connection->connect(opt_connect_retries - 1,
  opt_connect_retry_delay, 1) != 0)
  {
+ err << "Could not connect to cluster: '"
+ << g_cluster_connection->get_latest_error() << " - "
+ << g_cluster_connection->get_latest_error_msg() << "'" << endl;
  delete g_cluster_connection;
  g_cluster_connection = NULL;
  exitHandler(NdbToolsProgramExitCode::FAILED);