[IOT-2392] Fix json2cbor
[IOT-2392] Fix json2cbor

json2cbor failed to convert cred field of oic_svr_db_server_mfg.json
and oic_svr_db_client.json

Bug: https://jira.iotivity.org/browse/IOT-2392
Change-Id: Ib5a4c3bdc83a7156b63d899bc109bdf2dc58fb5a
Signed-off-by: ol.beketov <8b8402ce463b3ba6094920b3493fffa206a8eaa1@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/20539
Tested-by: jenkins-iotivity <d95b56ce41a2e1ac4cecdd398defd7414407cc08@iotivity.org>
Reviewed-by: Dan Mihai <ba8e1833495515b49ded9e20cae80a8129155aa9@microsoft.com>

iotivity/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,rzr/iotivity,rzr/iotivity,rzr/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity