Update SConscript in service

Update SConscript in service

Cleans SConscript in service folder by removing soft-sensor and
protocol plugin SConscript

Signed-off-by: hunje.yeon <hunje.yeon@samsung.com>
Change-Id: Iccc880151f6b77a43f6f956eb6a7a40da25547ee
Reviewed-on: https://gerrit.iotivity.org/gerrit/2869
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>
(cherry picked from commit b940439ce35a3f3a8cbf2ef2d86cfe5b056b509a)
Reviewed-on: https://gerrit.iotivity.org/gerrit/2893