apps.mellanox.connectx_test: add multicast and checks
apps.mellanox.connectx_test: add multicast and checks

eugeneia/snabb,snabbco/snabb,snabbco/snabb,Igalia/snabb,eugeneia/snabb,snabbco/snabb,Igalia/snabb,snabbco/snabb,Igalia/snabb,eugeneia/snabb,SnabbCo/snabbswitch,Igalia/snabb,SnabbCo/snabbswitch,SnabbCo/snabbswitch,Igalia/snabb,Igalia/snabb,SnabbCo/snabbswitch,eugeneia/snabb,eugeneia/snabb,eugeneia/snabb,snabbco/snabb,snabbco/snabb,eugeneia/snabb,eugeneia/snabb,Igalia/snabb,snabbco/snabb,snabbco/snabb,Igalia/snabb