Fix XML external entity vulnerability (CCSDK-3324)

Disabled XML external entity references to resolve XML external entity
vulnerability in 'SdncUebCallback.java'

Issue-ID: CCSDK-3324
Signed-off-by: Jonathan Platt <jonathan.platt@att.com>
Change-Id: If959e915921042fdd0ba2ff16e167005ba1beed8
1 file changed