[MERGE] Add tests for commit_message_template hooks.

[Jelmer Vernooij]

The attached patch adds a commit_message_template hook, which allows
plugins to modify the commit message that is displayed by default when
opening an editor to change the commit message.

Some use cases for this:

 * suggesting a commit message by taking the last entry or the newly added 
   lines from a ChangeLog file or a debian/changelog file 
   (like debcommit already does atm)
 * fill in "Merged [branch-nick]." when committing merges

Cheers,

Jelmer
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