GUACAMOLE-53: Add session affinity attribute for connection groups.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/schema/upgrade/upgrade-pre-0.9.10.sql

@@ -88,3 +88,10 @@ ALTER TABLE guacamole_connection_history
     FOREIGN KEY (connection_id)
     REFERENCES guacamole_connection (connection_id) ON DELETE SET NULL;
 
+--
+-- Add session affinity column
+--
+
+ALTER TABLE guacamole_connection_group
+    ADD COLUMN enable_session_affinity boolean NOT NULL DEFAULT FALSE;
+