fix atrt mysql_install_db, make sure no extra my.cnf is read

storage/ndb/test/run-test/files.cpp

@@ -155,12 +155,13 @@ setup_files(atrt_config& config, int setup, int sshx)
 	  const char * val;
 	  require(proc.m_options.m_loaded.get("--datadir=", &val));
 	  BaseString tmp;
-	  tmp.assfmt("%s/bin/mysql_install_db --datadir=%s > /dev/null 2>&1",
-		     g_prefix, val);
+	  tmp.assfmt("%s/bin/mysql_install_db --defaults-file=%s/my.cnf --datadir=%s > /dev/null 2>&1",
+		     g_prefix, g_basedir, val);
 	  if (system(tmp.c_str()) != 0)
 	  {
-	    g_logger.error("Failed to mysql_install_db for %s",
-			   proc.m_proc.m_cwd.c_str());
+	    g_logger.error("Failed to mysql_install_db for %s, cmd: >%s<",
+			   proc.m_proc.m_cwd.c_str(),
+			   tmp.c_str());
 	  }
 	  else
 	  {