2.2-SR Dhcp Relay

commit ad95aaf1afc57b5b64de148c9aea95f125a4f0a8 (HEAD -] onos-2.2, origin/onos-2.2)
Author: Andrea Campanella [andrea@opennetworking.org]
AuthorDate: Fri Mar 27 12:53:46 2020 +0100
Commit: Andrea Campanella [andrea@opennetworking.org]
CommitDate: Tue Apr 7 15:33:40 2020 +0000

[ONOS-8087] Per device purgeOnDisconnection Flag
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(cherry picked from commit 32a9c0b2d92a76e743e9e64eb2f1c6db2da77d12)

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