tests/test-merge3

Fix troubles with clone and exception handling

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Fix troubles with clone and exception handling

Clone deletes its directory on failure 

This was deleting the lockfile out from under the lock object before
it got destroyed

This patch shuts lock up and makes the cleanup code for clone a little
cleaner.

manifest hash: f666fddcf6f3a905020a091f5e9fd2cb5d806cdd
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#!/bin/sh -x

hg init
echo This is file a1 > a
hg add a
hg commit -t "commit #0" -d "0 0" -u user
touch b
hg add b
rm b
hg commit -A -t"comment #1" -d "0 0" -u user