Backward compatibilty support for Northbound v2 GET operation.

Sample output for a GET operation based on latest topic/schema branch : https://gist.github.com/1fc3dd2eb4d2391d16df
This provides the backward compatible support as in Hydrogen release.

Northbound v3 support will bring in the new and improved version of GET/PUT/POST operation.

Change-Id: I082afe8ef87ad594f0467d96f103dbed45888d5f
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>