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

[John Arbash Meinel]

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Martin Pool wrote:
> 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.
> 
> 

BB:approve

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