MCOL-66 - Make the DDL and DML parsers re-entrant.

Serialize all DDL because the VVS can't handle modifying the same block simultaneously
Fix the CTRL+C logic in DML that caused COMMIT issues.

dbcon/ddlpackageproc/ddlpackageprocessor.cpp

@@ -1,4 +1,5 @@
 /* Copyright (C) 2014 InfiniDB, Inc.
+   Copyright (C) 2016 MariaDB Corporation
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
@@ -80,6 +81,7 @@ using namespace ddlpackage;
 
 namespace ddlpackageprocessor
 {
+boost::mutex DDLPackageProcessor::dbrmMutex;
 
 DDLPackageProcessor::~DDLPackageProcessor()
 {