[IOT-1785] Implement roles from symmetric pair-wise keys

[IOT-1785] Implement roles from symmetric pair-wise keys

Implement roleId property of an oic.sec.cred object.

Fix error path bugs in CRED<->CBOR code to fail properly if
certain serialization subroutines fail; error codes were
being ignored. Fix error path memory leaks.

Also fix the ACL/ACL2<->CBOR code to use the correct JSON
field names per the schema. Fix error path memory leaks.

Change-Id: Ie9aa8baba5903c482acb3adc6ef617a1ced7db31
Signed-off-by: Kevin Kane <kkane@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18463
Reviewed-by: Alex Kelley <alexke@microsoft.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Dave Thaler <dthaler@microsoft.com>
Reviewed-by: Greg Zaverucha <gregz@microsoft.com>