Qi: fix doxygen

Change-Id: I009621b26d1b071c736d173a868c9a27a33e6ce2
Reviewed-on: http://gerrit.aldebaran.lan:8080/10913
Reviewed-by: clemolgat <clemolgat@aldebaran-robotics.com>
Tested-by: clemolgat <clemolgat@aldebaran-robotics.com>
EventLoop: Wait for io_service to terminate properly.

Otherwise handling propoper socket destruction is impossible.

Change-Id: I5ab2e2c112acd2a523138b77d7a543a056d02f12
Reviewed-on: http://gerrit.aldebaran.lan:8080/10613
Reviewed-by: mnottale <mnottale@aldebaran-robotics.com>
Tested-by: mnottale <mnottale@aldebaran-robotics.com>
monitorEventLoop: reset promise after notifying.

Change-Id: Id804d5a46890bcdc136e5f65b324857bf38f4127
Reviewed-on: http://gerrit.aldebaran.lan:8080/10614
Reviewed-by: mnottale <mnottale@aldebaran-robotics.com>
Tested-by: mnottale <mnottale@aldebaran-robotics.com>
Add missing mutex to qi::log TailFileLogHandler

This function was eventually triggered by `qiLog*() <<' calls, without
multithreading protection.

Might fix #11819.

Change-Id: Id614f999f2c26f2e5f65af25fe14eeb78ee7accb
Reviewed-on: http://gerrit.aldebaran.lan:8080/10986
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Tested-by: llec <llec@aldebaran-robotics.com>