This patch attemptes to clean up winbindd's mutex locking.

The current locking scheme in winbind is a complete mess - indeed, the
next step should be to push the locking into cli_full_connection(), but
I'll leave it for now.

This patch works on the noted behaviour that 2 parts of the connection
process need protection - and independent protection.  Tim Potter did
some work on this a little while back, verifying the second case.

The two cases are:
 - between connect() and first session setup
 - during the auth2 phase of the netlogon pipe setup.

I've removed the counter on the lock, as I fail to see what it gains us.

This patch also adds 'anonymous fallback' to our winbindd -> DC connection.

If the authenticated connection fails (wbinfo -A specifed) - say that
account isn't trusted by a trusted DC - then we try an anonymous.

Both tpot and mbp like the patch.

Andrew Bartlett
(This used to be commit 0620320002082298a15cbba72bd79aecfc607947)

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