Updating the host topology logic as the l2switch now has link info between host and switch

Change-Id: Ie95e5c29ab621ee6240ee1fc6ed97b9a13fad2e9
Signed-off-by: Lakshman Mukkamalla <lmukkama@cisco.com>
Merge "Updating the host topology logic as the l2switch now has link info between host and switch"