[MERGE] Add CommitBuilder.abort()

[Jelmer Vernooij]

This simple patch adds a CommitBuilder.abort() method for consistency.
The only way to abort a commit without this function is to use the write
group API, which is taken care of by CommitBuilder in all other code
paths: it starts a write group when the CommitBuilder is created and
commits a write group when the commit finishes.

Cheers,

Jelmer

-- 
Jelmer Vernooij <jelmer at samba.org> - http://samba.org/~jelmer/
Jabber: jelmer at fsfe.org
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