webdav:HTTPS PUT req issue

Motivation

webdav HTTPS redirect to encrypt transfers is working for GET requests but it is not for PUT requests and  after redirect the location is  still with http.

The problem was that the isSSl flag, based on the value of which either https or http protocl is used,  was not set  for upload.

Modification

Https PUT is possible.

Target: master, 6.2, 6.1, 6.0
Require-book: no
Require-notes: yes
Acked-by: Paul Millar
Patch: https://rb.dcache.org/r/12631/

modules/dcache-webdav/src/main/java/org/dcache/webdav/DcacheResourceFactory.java

@@ -839,6 +839,7 @@ public String getWriteUrl(FsPath path, Long length)
 
         String uri = null;
         WriteTransfer transfer = new WriteTransfer(_pnfs, subject, restriction, path);
+        transfer.setSSL(_redirectToHttps && ServletRequest.getRequest().isSecure());
         _transfers.put((int) transfer.getId(), transfer);
         try {
             transfer.createNameSpaceEntry();