[MERGE] Change TransportError to be a BzrNewError

[John Arbash Meinel]

While jrydberg and I were working on the multi-range http changes, we
came across the fact that TransportError is still an old style error.
So jrydberg updated as the attached bundle.

I'm happy with the change, and it makes adding new errors to the
TransportError hierarchy nicer. So +1 from me.

John
=:->
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