Add Fake DNS support (#309)

Co-authored-by: Xiaokang Wang <xiaokangwang@outlook.com>
Co-authored-by: loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
Co-authored-by: kslr <kslrwang@gmail.com>

infra/conf/init.go

@@ -0,0 +1,5 @@
+package conf
+
+func init() {
+	RegisterConfigureFilePostProcessingStage("FakeDNS", &FakeDNSPostProcessingStage{})
+}