kamailio.cfg: load ctl and mi_rpc modules

- enables usage of sercmd tool with default config
(cherry picked from commit 80a8fc22b8488c358fc12f0a6ce684ffe32f1d1c)

etc/kamailio.cfg

@@ -127,6 +127,8 @@ loadmodule "uri_db.so"
 loadmodule "siputils.so"
 loadmodule "xlog.so"
 loadmodule "sanity.so"
+loadmodule "ctl.so"
+loadmodule "mi_rpc.so"
 loadmodule "acc.so"
 /* uncomment next lines for MySQL based authentication support 
    NOTE: a DB (like db_mysql) module must be also loaded */