Fixed smppccm tests

Since perspective_connector_start() is now using yields (and annotated
with @defer.inlineCallbacks), calls to this method must also be updated
to handle the returned deferred, smppccm.py's start() is now yielding to
wait/block for the returned deferred.
Fixed coverage related test

When running trial through coverage it takes more time and can lead to
failing tests when measuring time, test_redelivery_of_rejected_messages
were measuring throughput of messaging when it is not really its job,
it must only ensure that all messages are redilevered after rejection.