Add 2.1 -> 2.2 sql file, move dummy

Author: hashworks

src/monitor/pgautofailover--2.1--2.2.sql

@@ -0,0 +1,7 @@
+--
+-- extension update file from 2.1 to 2.2
+--
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION pgautofailover" to load this file. \quit
+
+-- no changes, just the version number