[Easy-Setup] Updated Doxygen and javadoc

[Easy-Setup] Updated Doxygen and javadoc

- Updated Doxygen and javadoc updates for easysetup service based
  on latest folder structure

Change-Id: I4a3d888fb30a6a334aba3d7cd5fe4ed019b2ed75
Signed-off-by: Jay Sharma <jay.sharma@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5825
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>
(cherry picked from commit 0c97f909f863c325b2e4de71f0486b173617cf3e)
Reviewed-on: https://gerrit.iotivity.org/gerrit/5943