[PATCH] Infinite re-prompts for user credentials

Here is a patch which will re-prompts for user credentials infinite times.
I saw rapidSVN uses cranky way to get the infinite prompts, where they
set the retry_limit to a arbitrary large value. This patch can accept
a negative value for the retry_limit, to make it infinite. At present
if a value above zero is give for the retry_limit,
svn_auth_next_credentials() will re-prompt for user credentials up to
a maximum of retry_limits.

This is a behavioral change but I don;t think there exists any application
that sets negative value for retry_limit, So might be safe not to create new
versions of these changed functions.

[[[
A negative value to the retry_limit will re-prompt for user credentials
infinite times.

* subversion/libsvn_subr/ssl_client_cert_pw_providers.c
  (ssl_client_cert_pw_prompt_next_cred): Modified not to give up if a
   negative value is given as retry_limit.

* subversion/libsvn_subr/ssl_client_cert_providers.c
  (ssl_client_cert_prompt_next_cred): Modified not to give up if a
   negative value is given as retry_limit.

* subversion/libsvn_subr/username_providers.c
  (username_prompt_next_creds): Modified not to give up if a
   negative value is given as retry_limit.

* subversion/libsvn_subr/simple_providers.c
  (simple_prompt_next_creds): Modified not to give up if a
   negative value is given as retry_limit.

* subversion/include/svn_client.h
* subversion/include/svn_auth.h
  Fix doc to reflect above change.

Patch by: Alexander Thomas <alexander_at_collab.net>
]]]

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