[PROVISIONING] change description in spec

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[PROVISIONING] introduce signal sending

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[PROVISIONING] implement signal sending

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[PROVISIONING] send signal

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[PROVISIONING] test add signal receiving

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>