Adding a method to process Identities in a YANG Model

Change-Id: Ic07025c3c86d847d2882d80fa360e9a5978275df
Signed-off-by: Mayank Agarwal <mayagarw@cisco.com>
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>
Merge "Adding a method to process Identities in a YANG Model"