Fixed incorrect instanceof in yang-data-operations.

Intended check was to check for AugmentationIdentifier,
AugmentationNode was incorrectly checked.

Change-Id: Ice6f31407c1b8f0bb2400685730324503cd05e44
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
Merge "Fixed incorrect instanceof in yang-data-operations."