qi::os::fnmatch: add many tests

Change-Id: Ia6092fe10c93817ec08702fb73c6a0df18855768
Reviewed-on: http://gerrit.aldebaran.lan/19342
Tested-by: gerrit
Reviewed-by: pagoya <pagoya@aldebaran-robotics.com>
qi::os::fnmatch: document

Change-Id: Iaa66eecf743a84a3e583cb74b4cd23b5ba5e94e2
Reviewed-on: http://gerrit.aldebaran.lan/19776
Reviewed-by: pagoya <pagoya@aldebaran-robotics.com>
Tested-by: pagoya <pagoya@aldebaran-robotics.com>