Use stack.putDocument in XCAP received 401 Unauthorized

```
What steps will reproduce the problem?
1. Use putDocument() in XCAP stack
2. Server reponsed 401 Unauthorized which client not put again in
Proxy-authorization: nonce="xxx" reponse="xxx"
3. SIP request was OK, first also received 401 Unauthorized then in second
request, it send nonce, username, reponse to authenticate.
4. Doubango 2.0 not allow xcap message?

What is the expected output? What do you see instead?
A should be able to reponse 200 OK in second request.

What version of the product are you using? On what operating system?
Android 4.2.2

Please provide any additional information below.
IMSdroid 2.569.1089
```

Original issue reported on code.google.com by `mr.kun...@gmail.com` on 13 Jun 2014 at 2:13

Attachments:
- [put_xcap.txt](https://storage.googleapis.com/google-code-attachments/imsdroid/issue-521/comment-0/put_xcap.txt)
- [respone_xcap.txt](https://storage.googleapis.com/google-code-attachments/imsdroid/issue-521/comment-0/respone_xcap.txt)

Start with the attached put_xcap.txt and respone_xcap.txt traces, then trace the XCAP putDocument() request in IMSdroid on Android. Compare the first and second 401 Unauthorized responses with the SIP authentication flow; done means the second request includes the required nonce, username, and response and receives 200 OK.

Written by the indexing model from the issue text.