MXS-2274 Add test

Check that use of reserved names (those starting with "@@") in
configuration file is rejected.

maxscale-system-test/cnf/maxscale.cnf.template.no_use_of_reserved_names

@@ -0,0 +1,57 @@
+[maxscale]
+threads=###threads###
+
+[@@server1]
+type=server
+address=###node_server_IP_1###
+port=###node_server_port_1###
+protocol=MySQLBackend
+
+[server2]
+type=server
+address=###node_server_IP_2###
+port=###node_server_port_2###
+protocol=MySQLBackend
+
+[server3]
+type=server
+address=###node_server_IP_3###
+port=###node_server_port_3###
+protocol=MySQLBackend
+
+[server4]
+type=server
+address=###node_server_IP_4###
+port=###node_server_port_4###
+protocol=MySQLBackend
+
+[MySQL-Monitor]
+type=monitor
+module=mysqlmon
+servers=@@server1,server2,server3,server4
+user=maxskysql
+password=skysql
+monitor_interval=1000
+
+[@@RW-Split-Router]
+type=service
+router=readwritesplit
+servers=@@server1,server2,server3,server4
+user=maxskysql
+password=skysql
+
+[RW-Split-Listener]
+type=listener
+service=@@RW-Split-Router
+protocol=MySQLClient
+port=4006
+
+[CLI]
+type=service
+router=cli
+
+[CLI-Listener]
+type=listener
+service=CLI
+protocol=maxscaled
+socket=default

maxscale-system-test/config_test.cpp

@@ -23,6 +23,7 @@ const char* bad_configs[] =
     "mxs1731_empty_param",
 // passwd is still supported
 //    "old_passwd",
+    "no_use_of_reserved_names",
     NULL
 };