flags: Remove anonymous, ratelimit, json and web-address flags.

- Web address now uses the port + 1 from the API address port directly.
- Remove ratelimiting, ratelimiting will be achieved if necessary through
  iptables.
- Remove json flag, not needed anymore.
- Remove anonymous flag, server will be no more anonymous for play.minio.io
  we will use demo credentials.

signature-handler.go

@@ -60,13 +60,6 @@ func isRequestPostPolicySignatureV4(req *http.Request) bool {
 	return false
 }
 
-func isRequestRequiresACLCheck(req *http.Request) bool {
-	if isRequestSignatureV4(req) || isRequestPresignedSignatureV4(req) || isRequestPostPolicySignatureV4(req) {
-		return false
-	}
-	return true
-}
-
 func (s signatureHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if isRequestPostPolicySignatureV4(r) && r.Method == "POST" {
 		s.handler.ServeHTTP(w, r)