DeviceServiceImpl: change logging approach on pairing
DeviceServiceImpl: change logging approach on pairing

The lambda handling responses from gateway now does not call this->logger()
to avoid any use-after-free that might potentially happen.

Signed-off-by: Jan Viktorin <3eab6ac54c005c4408f608556a6663b7f2abede7@fit.vutbr.cz>

BeeeOn/server,BeeeOn/server,BeeeOn/server,BeeeOn/server