easy-setup: Rename header to EasySetup.hpp

easy-setup: Rename header to EasySetup.hpp

Prevent potential name clash on case insensitive filesystems:

./service/easy-setup/mediator/richsdk/inc/EasySetup.h
./service/easy-setup/enrollee/inc/easysetup.h

Mediator one is C++ so we rename it to .hpp

Change-Id: I6d784378b5065b162d06abb2338bf70e0147d864
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16479
Reviewed-by: George Nash <george.nash@intel.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>