Console emulator script to allow vivado/questa console quick tests

[alessandrothea]

The need for a Vivado/Questa installation makes difficult to validate the corresponding console interface in all conditions.
For instance, Vivado installations cannot be shared between OSs (e.g. CC7 and Centos8) which, combined with Vivado's installation size, limits the use of docker containers to the native runner OS, for jobs that invoke Vivado.

The solution to allow simple console tests is to add a dummy console emulator script that minimally mimics the application console behaviour:

• banner
• prompt
• command echo
• exit command

Obviously the console emulator must be reachable by other test scripts.