This commit fixes the way baud rate is generated from the program argument in

the FTPS client and agent.

A table has been added to the FTPS client and agent code that correlates
the baud rate value with the encoding.

A function has been added to the FTPS client and agent to take the program
argument for baud rate and use it to look up the table and return the entry
containing both the value and the encoding.

The value is displayed for the user and the encoding is sent to the uart
node constructor.

Signed-off-by: David Riseborough <drisebor@hotmail.com>