Fixed bug of gernerating pin during randompin OTM

Fixed bug of gernerating pin during randompin OTM

Bug : During generating randompin, the bound of curIndex is one more.

Patch 1: Upload patch.

Change-Id: I0c6416adaa8f0fbd8eeb936a0cc17b64047b9222
Signed-off-by: js126.lee <js126.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15579
Reviewed-by: Jongmin Choi <jminl.choi@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
(cherry picked from commit 78fdef84ed34707fac4bf3a6f9abf20803046f88)
Reviewed-on: https://gerrit.iotivity.org/gerrit/15583