Retrieve on /oic/res?rt=oic.d.xxx should return as per oic.if.ll

Retrieve on /oic/res?rt=oic.d.xxx should return as per oic.if.ll
rather than returning as per oic.if.baseline.

This change set the default interface of /oic/res as oic.if.ll when
no interface is specified in the enquiry.

JIRA issue: https://jira.iotivity.org/browse/IOT-1103

Change-Id: I7694be578aec57b640ba6fdc84c4fec472fe92f5
Signed-off-by: Ziran Sun <ziran.sun@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/8415
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Mushfiqul Islam <i.mushfiq@samsung.com>