qi.messaging: Tunes down a warning log in `ServiceDirectory`.
qi.messaging: Tunes down a warning log in `ServiceDirectory`.

This log often appeared in user application logs even though users
cannot do anything about it. As it is a common case that is not an
issue, this patch lowers its level from warning to verbose.

Change-Id: I7e27ce6cb7536210a038345bb828e8cdce2d1b00
Reviewed-on: http://gerrit.aldebaran.lan/96244
Reviewed-by: vincent.palancher <f8ff75e1c61314c499fafa8de0d9e004e87e66b0@softbankrobotics.com>
Reviewed-by: jmonnon <8898eaf233516e520f996a244ca8a12d20f948b1@aldebaran.com>
Reviewed-by: jlamotte <70353e7b0c7d18b7fc75605daf0ccba69fcd3222@aldebaran.com>
Tested-by: vincent.palancher <f8ff75e1c61314c499fafa8de0d9e004e87e66b0@softbankrobotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi