RPi motor control model: add block to invoke model run on the target.

The method to transfer and run model executable on target
requires SSH key authentication. Use next commands to generate
and transfer required key to RPi

   ssh-keygen -f target-ssh-key
   ssh-copy-id -i target-ssh-key.pub pi@147.32.86.147
   ssh-copy-id -i target-ssh-key.pub root@147.32.86.147

If you have no root access on device then you can use
pi account and then

   sudo cat /home/pi/.ssh/authorized_keys >>/root/.ssh/authorized_keys
   sudo chown root:root /root/.ssh/authorized_keys
   sudo chmod 0600 /root/.ssh/authorized_keys

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>