refs.c: enable large transactionssb/remove-fd-from-ref-lock

This is another attempt on enabling large transactions
(large in terms of open file descriptors). We keep track of how many
lock files are opened by the ref_transaction_commit function.
When more than a reasonable amount of files is open, we close
the file descriptors to make sure the transaction can continue.

Another idea I had during implementing this was to move this file
closing into the lock file API, such that only a certain amount of
lock files can be open at any given point in time and we'd be 'garbage
collecting' open fds when necessary in any relevant call to the lock
file API. This would have brought the advantage of having such
functionality available in other users of the lock file API as well.
The downside however is the over complication, you really need to always
check for (lock->fd != -1) all the time, which may slow down other parts
of the code, which did not ask for such a feature.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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