[merge] change tests to use reduceLockdirTimeout rather than reimplementing it

[Martin Pool]

jml and I are working on <https://launchpad.net/bugs/172392>, and
noticed that some tests hardcode something close to what
reduceLockdirTimeout does, even though it's always set up by the
TestCaseWithMemoryTransport base class.

This actually gives it a 0 second timeout rather than 1 but I think
this is equivalent - it still tries the lock once.

-- 
Martin <http://launchpad.net/~mbp/>
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