Bug 865: Fixed use of removed deprecated YANGInstanceIdentifier methods.

Some components in controller still used methods which was deprecated
before Helium and was removed after Helium was released to accomodate
API changes for 0.7.0 Yangtools. This patch migrates code to replacement
methods.

Change-Id: I146a08caefeb0d666223cf66600a4342a5b49165
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>