PLT-6076 Adding viper libs for config file changes (#5871)

* Adding viper libs for config file changes

* Removing the old fsnotify lib

* updating some missing libs

vendor/github.com/NYTimes/gziphandler/gzip.go

@@ -117,6 +117,7 @@ func (w *GzipResponseWriter) Close() error {
 
 	err := w.gw.Close()
 	gzipWriterPools[w.index].Put(w.gw)
+	w.gw = nil
 	return err
 }