Bug#20225 mysqltest runs in an endless loop when trying to start rpl_sys test suite

 - Add printout in safe_connect indicating that mysqltest is in a loop waiting for
connection to mysqld. Will be printed when --verbose is passed as argument to
  mysqltest

client/mysqltest.c

@@ -2970,7 +2970,12 @@ void safe_connect(MYSQL* mysql, const char *name, const char *host,
     if ((mysql_errno(mysql) == CR_CONN_HOST_ERROR ||
          mysql_errno(mysql) == CR_CONNECTION_ERROR) &&
         failed_attempts < opt_max_connect_retries)
+    {
+      verbose_msg("Connect attempt %d/%d failed: %d: %s", failed_attempts,
+                  opt_max_connect_retries, mysql_errno(mysql),
+                  mysql_error(mysql));
       my_sleep(connection_retry_sleep);
+    }
     else
     {
       if (failed_attempts > 0)