Adds check for no protocol and some minor CLI fixes.

- Adds check to deny config file with no specified protocol to prevent
  loading of empty config file.
- Moves CLI init before config parse to receive immediate error message
  when cannot open control socket.
- Fixes socket name path check and other error handling in CLI init.

conf/conf.c

@@ -114,6 +114,8 @@ config_parse(struct config *c)
   rt_preconfig(c);
   cf_parse();
   protos_postconfig(c);
+  if (EMPTY_LIST(c->protos))
+    cf_error("No protocol is specified in the config file");
 #ifdef IPV6
   if (!c->router_id)
     cf_error("Router ID must be configured manually on IPv6 routers");