Retrieve FW version

Make sure that FW version could be retrieved successfully

Try to retrieve FW version and verify the output

1. Initialize EAL and start the iut_port

2. Allocate an obviously insufficient buffer to store FW version string

3. Try to retrieve FW version and, if successful, get the actual length

4. Reallocate the buffer sufficient to accommodate the actual string

5. Try to retrieve the full string

6. Verify the output

Parameters:

ethdev_state

Ethernet device state