Fixed bug in compared WILDCARD_SUBJECT_ID

Fixed bug in compared WILDCARD_SUBJECT_ID

Issue : If the first character of deviceuuid generated ramdomly is *(2a) in PT,
        subjectuuid of cred is set to * wrongly instead of actual deviceuuid
        during generating cred payload during OT.

Change-Id: Idc6587d71456a1eb7a816bd083bfcbb5c94e9c34
Signed-off-by: js126.lee <js126.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18041
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Nathan Heldt-Sheller <nathan.heldt-sheller@intel.com>