Fixed PostgreSQL SessionImpl, 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()

Data/PostgreSQL/src/SessionImpl.cpp

@@ -151,6 +151,12 @@ void SessionImpl::close()
 }
 
 
+void SessionImpl::reset()
+{
+
+}
+
+
 bool SessionImpl::isConnected() const
 {
 	return _sessionHandle.isConnected();