build: Use sys.exit instead of exit

build: Use sys.exit instead of exit

This change is to fix conflict between master and 1.3-rel

Reviewed-on: https://gerrit.iotivity.org/gerrit/19955

Bug: https://jira.iotivity.org/browse/IOT-2237
Change-Id: Ib000a648b889d7d9956d6b26a9dc2111e7b96200
Origin: https://gerrit.iotivity.org/gerrit/#/c/20877/
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/20877
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
(cherry picked from commit f99878445ce793627a4af92e26c9b1ce797b8949)
Reviewed-on: https://gerrit.iotivity.org/gerrit/21005
Reviewed-by: Mats Wichmann <mats@linux.com>
Reviewed-by: Habib Virji <habib.virji@samsung.com>