MCOL-537 Regression test doesn't tolerate 'failed' in stderr, stdout.

I reformulate the messages.

    Changed version in preprocessor conditions to avoid compilation
    warnings in Debian 9.

    Disabled sign-compare check for generated files in DML/DDL.

dbcon/mysql/ha_pseudocolumn.cpp

@@ -53,8 +53,6 @@ void bailout(char* error, const string& funcName)
 
 int64_t idblocalpm()
 {
-    THD* thd = current_thd;
-
     if (get_fe_conn_info_ptr() == NULL)
         set_fe_conn_info_ptr((void*)new cal_connection_info());