2.1-SR Dhcp Relay

commit 09da904c10670d329e73321b9c463b7af1397e7d (HEAD -] onos-2.1, origin/onos-2.1)
Author: Yi Tseng [yi@opennetworking.org]
AuthorDate: Tue May 7 16:51:05 2019 -0700
Commit: Carmelo Cascone [carmelo@opennetworking.org]
CommitDate: Wed May 8 05:41:43 2019 +0000

[ONOS-7982] Remove P4Config
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(cherry picked from commit b81121fc2162de37dec87d19bdd928ff3ab5e099)

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