kamailio.cfg: load cfg_rpc module to allow runtime updates

- use request_route { ... } instead of route { ... } for easier
  reference in docs and discussions

etc/kamailio.cfg

@@ -222,6 +222,7 @@ loadmodule "siputils.so"
 loadmodule "xlog.so"
 loadmodule "sanity.so"
 loadmodule "ctl.so"
+loadmodule "cfg_rpc.so"
 loadmodule "mi_rpc.so"
 loadmodule "acc.so"
 
@@ -438,7 +439,8 @@ modparam("debugger", "cfgtrace", 1)
 
 # Main SIP request routing logic
 # - processing of any incoming SIP request starts with this route
-route {
+# - note: this is the same as route { ... }
+request_route {
 
 	# per request initial checks
 	route(REQINIT);