Merge bugfix #2546 from poco-1.9.1 (#2548)

* Merge bugfix #2546 from poco-1.9.1

* Fixed ODBC SessionImpl

* Fixed missing methods in PostresSQL and testsuit

* Fixed missing method in SQLite SessionImpl

* Use mysql_refresh() instead of mysql_reset_connection()

* Use mysql_reset_connection() if it is available

Use mysql_reset_connection() only if MySQL version is >= 5.7 or MariaDB
version is >= 3.0.0 otherwise fall back to myslq_refresh()

SQL/SQLite/src/SessionImpl.cpp

@@ -216,6 +216,11 @@ void SessionImpl::close()
 }
 
 
+void SessionImpl::reset()
+{
+}
+
+
 bool SessionImpl::isConnected() const
 {
 	return _connected;