evapi: start evapi dispatcher process with rpc rank

- it may be used for handling responses from external app with sip
  related functions
- reported by GH #622

modules/evapi/evapi_mod.c

@@ -184,7 +184,7 @@ static int child_init(int rank)
 		return 0;
 	}
 
-	pid=fork_process(PROC_NOCHLDINIT, "EvAPI Dispatcher", 1);
+	pid=fork_process(PROC_RPC, "EvAPI Dispatcher", 1);
 	if (pid<0)
 		return -1; /* error */
 	if(pid==0) {