[IOT-1451] Keep client callback when receiving error result

[IOT-1451] Keep client callback when receiving error result

when Client receive error code from some server after request
oic/res. clientCB is removed by return value "OC_STACK_DELETE_
TRANSACTION"

Change-Id: Ibf42740078f0ed6a97ee3b18d22559b0d2fbdf43
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13237
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jaewook Jung <jw0213.jung@samsung.com>
Reviewed-by: MyeongGi Jeong <myeong.jeong@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>