TUN-6775: Add middleware.Handler verification to ProxyHTTP

ProxyHTTP now processes middleware Handler before executing the request.
A chain of handlers is now executed and appropriate response status
codes are sent.

ingress/middleware/jwtvalidator_test.go

@@ -1,6 +0,0 @@
-package middleware
-
-import "testing"
-
-func TestJWTValidatorHandle(t *testing.T) {
-}