Modify resourceCache codes to synchronize the cacheDataList and to avoid retransmission

Modify resourceCache codes to synchronize the cacheDataList and to avoid retransmission

- add std::mutex for synchronization of cacheDataList valuable
- add lastSequenceNum valuable to avoid retransmission

Change-Id: I19cc85084d916b91f359ca116e1b3ef69db2150b
Signed-off-by: YounghyunJoo <yh_.joo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2019
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Habib Virji <habib.virji@samsung.com>
Tested-by: Habib Virji <habib.virji@samsung.com>