Update ietf-inet-types and ietf-yang-types with RFC6991

Change-Id: Ie6f6891835f761c440650a2d0d7990db20f9d52f
Signed-off-by: Robert Varga <rovarga@cisco.com>
Added ietf-restconf yang module

Change-Id: Ifd8012f2ba2b436b68d590caaed512900733fe17
Signed-off-by: Martin Sunal <msunal@cisco.com>
Merge "Update ietf-inet-types and ietf-yang-types with RFC6991"
Merge "Added ietf-restconf yang module"