BUG-2511 Fix XXE vulnerability in Netconf

Change-Id: I299468f9f6d72a125457e03a9b6796d65d016ecd
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Signed-off-by: Ed Warnicke <eaw@cisco.com>
BUG-2511 Fix possible XXE vulnerability in restconf

Change-Id: I5273e69b83d44360f0739ad67cbafdacb9617c0d
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Signed-off-by: Ed Warnicke <eaw@cisco.com>
BUG-2511: disable external entitiy resolution with EXI

OpenEXI transmogrifier can resolve external entities. This should never
be necessary in NETCONF context, so disallow that. The same goes for the
reader, but there we need to add a custom EntityResolver.

Change-Id: I09e1fcb27cd72f1e354183513978d23239909849
Signed-off-by: Robert Varga <rovarga@cisco.com>
Signed-off-by: Ed Warnicke <eaw@cisco.com>
Version bump Helium-SR1.1 release

Change-Id: Ieefbfa3933455e41c1b9ef280ddeb459b8288dc1
Signed-off-by: Ed Warnicke <eaw@cisco.com>