Fix problem for multiple api call

Fix  problem  for multiple api call

It is thread issue. So, add lock mechanism.
Fix [IOT-263]

Change-Id: Ic0fac30b1a4c0c305af607e5caa7c1afd21163b6
Signed-off-by: Jack Lee <jjack.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/243
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
(cherry picked from commit 522c05e82f1ccd3ae2cf4b4a63ec414f7ebcb8ce)
Reviewed-on: https://gerrit.iotivity.org/gerrit/381
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>