Change transactor to use assertions

[pear7]

Change the transactor to use assertions in the transactor to validate that the output of the encoder and decoder are correct instead of sending the data back to the hvl testbench.

[pear7]

Resolved as part of 80c673f . Removed the output pipe and replaced it with 2 assertions in the Transactor, 1 to check for correct encryption and a second to check for correct decryption. Both have been tested and work as expected.