[API]: Fix for multiple HTTP or TCP ports per device

Change-Id: I4f28a42025c2d1520f2bb6bc86941cc7ee503212
[WORKER] Allow stickiness for TCP sessions

Stickiness to a particular backend node will be based on source
IP address. Caveat: For NAT'd sources, this means everyone always
hits the same backend node.

Change-Id: I8822f9bd92ac17270e9685d33268658516a28630