[MERGE] Make bzrlib.smart.medium use lazy imports

[John Arbash Meinel]

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This is my hack-around for the problems with Crypto.Util.randpool

Basically, my making the imports in bzrlib.smart.medium be lazy, just
running the test suite doesn't have to import transport.ssh, which means
it doesn't have to create a RandomPool object.

It is a bit quick-and-dirty, but I figure it is good to have anyway, and
it makes *my* life better. (It only really effects the first test, but
if you are trying to do TDD, having 1.5s of wasted startup time is very
perceptible.)

John
=:->
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