Fix issue related SVACE in oickeepalive

Fix issue related SVACE in oickeepalive

Change-Id: I4c788411bcd8eb4251d292e0bf56ab470dfcafc1
Signed-off-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/7481
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Hyuna Jo <hyuna0213.jo@samsung.com>
Reviewed-by: Jon A. Cruz <jon@joncruz.org>
(cherry picked from commit ede0115adf224edcca0d80c6f7f87140c0de8451)
Reviewed-on: https://gerrit.iotivity.org/gerrit/7611
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>