This patch update OSC plugin to support basic portgroup operations: * create * delete * list * show * set * unset Related-Bug: #1618754 Co-Authored-By: Kyrylo Romanenko <kromanenko@mirantis.com> Co-Authored-By: Vladyslav Drok <vdrok@mirantis.com> Change-Id: Ic9c37495a82b9115d97f9b330cc13a1063f8b529