do code optimization of EntityHandler.

do code optimization of EntityHandler.

our service has three entityHandler.
almost, which of operation same is response.

second patch included one more optimization.
our service not using the response value in EntityHandler.
so, i remove related response value.

third patch included remove set ehResultValue.
because of, our service is ehResult value always return OC_EH_OK.

fifth patch included remove comments and not required value.
remove unnecessary comments and not required value in NSProviderListener.c
payload value is not used.

Change-Id: I719a65e70f3ad51da0ed0488be48b973e8a61ab7
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9825
Reviewed-by: Abitha Shankar <abitha.s@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>