Update db files and Fix json2cbor tool

Update db files and Fix json2cbor tool

patch#1 : 1. Update dat/json files.
          2. Fix json2cbor tool about CRED
patch#2 : Rebase to resolve conflict, minor fix
patch#3 : Resolve SVACE issue, check return value

Change-Id: Ibcaa8f2d0588924e42ab8985dac7b15a82579c8c
Signed-off-by: Yonggoo Kang <ygace.kang@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/6301
Reviewed-by: Dmitriy Zhuravlev <d.zhuravlev@samsung.com>
Reviewed-by: dongik Lee <dongik.lee@samsung.com>
Reviewed-by: Jongsung Lee <js126.lee@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>