[MERGE] Remove unnecessary test helpers from test_smart_transport

[Andrew Bennetts]

This fairly small change just removes some unnecessary complexity from
test_smart_transport.  It removes the “InstrumentedServerProtocol” test double,
and removes the setUp method from TestSmartProtocol entirely.  It also moves
test_server_offset_serialisation up the inheritance hierarchy one level, so that
it doesn't need to be duplicated.

The diffstat shows many more deletions than additions:

 test_smart_transport.py |   94 +++++++++++++++---------------------------------
 1 file changed, 31 insertions(+), 63 deletions(-)

This is another small step towards the smart protocol v3 work.

-Andrew.

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