More PKCS#11 fixes for gnutls master

[Stef Walter]

Attached are three more fixes to gnutls master for bugs and documentation.

Do these changes look okay? Would it be better to deprecate or change
the gnutls_pkcs11_init() function, rather than just marking the argument
as unused?

Stef



commit 938f959a23b05ea2407bef067d54ce8b1e3cb6ec
Author: Stef Walter <stefw at collabora.co.uk>
Date:   Mon Aug 1 11:12:57 2011 +0200

    Don't try to do PKCS#11 login if session is already logged in.

     * It is possible for new PKCS#11 sessions to be logged in if
       another logged in session already exists.
     * In these cases, don't log in, but detect the condition and
       return success.

commit d5c239f7542916b4fd50386476256c89d8cef58b
Author: Stef Walter <stefw at collabora.co.uk>
Date:   Mon Aug 1 11:11:01 2011 +0200

    When finding private keys fail, return error code.

     * Previously this would result in an endless loop.

commit c68258d60c35426a89081705874b6d2acbba0ed9
Author: Stef Walter <stefw at collabora.co.uk>
Date:   Mon Aug 1 09:45:44 2011 +0200

    Mark the config argument of gnutls_pkcs11_init() as unused

     * Since its no longer used.

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