master-SR Dhcp Relay

commit 468e785cd00348b71980f8a3254d49d4442633c7 (HEAD -] master, origin/master, origin/HEAD)
Author: Daniel Park [dan.mcpark84@gmail.com]
AuthorDate: Sat Jul 28 00:38:45 2018 +0900
Commit: Jian Li [pyguni@gmail.com]
CommitDate: Sat Jul 28 11:51:41 2018 +0000

Supports MTU option in OpenstackSwitching dhcp handler.

Case 1: DHCP v4 tests with 4 clients attached to switch directly and 1 server attached to switch directly, with 3 ONOS instances - FAIL