Changing DOXM resource to be normally discoverable

Changing DOXM resource to be normally discoverable

Issue: DOXM is not listed by default in /oic/res response.
Resolve : Changeg DOXM to be normally discoverable

PT should use secure port of DOXM for OTM and Provision,
even if Device has different COAPS ports per resource.

Patch 1: Init
Patch 2: According to review of Randeep, modified form strcmp to strncmp

Change-Id: I7742681b75261694c809e98f639379332c77e3b5
Signed-off-by: js126.lee <js126.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/8527
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>