MDEV-9038 Binlog encryption tests

- created binlog_encryption test suite and added it to the default list
- moved some tests from rpl, binlog and multisource suites to extra
  so that they could be re-used in different suites
- made minor changes in include files

mysql-test/include/reset_master_slave.inc

@@ -0,0 +1,29 @@
+#
+# The include file runs RESET ALL for every replication connection
+# currently present in SHOW FULL SLAVE STATUS output on the server,
+# and also runs RESET MASTER on the same server.  
+#
+
+--let $include_filename= reset_master_slave.inc
+--source include/begin_include_file.inc
+
+--disable_query_log
+--disable_result_log
+--disable_warnings
+--let $default_master = `SELECT @@default_master_connection`
+--let $con_name = query_get_value(show all slaves status, Connection_name, 1)
+while ($con_name != 'No such row')
+{
+	eval set default_master_connection = '$con_name';
+	stop slave;
+	--source include/wait_for_slave_to_stop.inc
+	reset slave all;
+	--let $con_name = query_get_value(show all slaves status, Connection_name, 1)
+}
+
+--error 0,ER_FLUSH_MASTER_BINLOG_CLOSED
+reset master;
+set global gtid_slave_pos='';
+eval set default_master_connection = '$default_master';
+--source include/end_include_file.inc
+