Removed compiler warnings for security modules.

Removed compiler warnings for security modules.

Patch #1 : initial upload.
Patch #2 : retrigger.
Patch #3~4 : update according to comments.
Patch #5 : rebase

Change-Id: Ie5009c484f50d40c8a2e2f9ac7c361cd9a712d93
Signed-off-by: Chul Lee <chuls.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15045
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
(cherry picked from commit b897b55effa48f2f99fd598947ad65db19ca49e4)
Reviewed-on: https://gerrit.iotivity.org/gerrit/16139