Bug 6329: Parser fails when target node of uses-augment is an unknown node
Yang parser fails when target node of uses-augment is an unknown node. It is not
quite clear whether such yang model is valid according to RFC6020 or not, but
yang parser failure causes lots of trouble, because such augment is used widely
in some yang models. So this patch prevents failure of yang parser and rather
introduces a warning and augmentation is not performed, when target node is
an unknown node.
Change-Id: I7f1c5d7b3ef0898ca098466702d7cb1ad7a0f30f
Signed-off-by: Peter Kajsa <pkajsa@cisco.com>