[MERGE] Add tests for start_commit hook.

[Jelmer Vernooij]

This patch adds a start_commit hook for MutableTrees (bug 186422). This
hook is executed before a commit is started and can actually modify the
state of the working tree, for example by adding files. This patch is
required to be able to support bzr in etckeeper
(http://kitenet.net/~joey/code/etckeeper/)

Cheers,

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