build: introduce the 'check' target

The check target will install fw-admin and run the testbench.

To run:
 % sudo make check

Signed-off-by: Arturo Borrero Gonzalez <aborrero@cica.es>
test: add options to testbench.sh

Let's add options to testbench.sh using getopt(1):
 -h show help
 -d turn on debug mode
 -y run directly

Signed-off-by: Arturo Borrero Gonzalez <aborrero@cica.es>