[merge][#159589] Re: LockContention has unhelpful text

[Martin Pool]

This makes LockContention include the lock file name in more cases, so
that you get some clue as to what's happening.  I reproduced this
earlier while trying to branch from a branch while pushing it.  (I
think that in turn is another instance of the shortcomings of
write-locking the dirstate to update the cache while doing a readonly
operation, but giving a better message here will make it more
obvious.)

This includes a bonus fix for the repr of SmartClientStreamMedium; see
the comment.

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