Update a CBOR parser logic for well-known keywords to OIC

Update a CBOR parser logic for well-known keywords to OIC

I've updated a CBOR parsing logic When CBOR parser encounters a well-known
keyword like "href" as an attribute.
If the attribute is *NOT* on the outermost representation bracket, it is
treated as a normal attribute.

Change-Id: I1f1c28dd59ae09e1f3f8ab0188c59a1b9fc3b950
Signed-off-by: Jihun Ha <jihun.ha@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5597
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>