Fixing Radware LBaaS v2 driver LB deletion
Fixing Radware LBaaS v2 driver LB deletion

Fixing Radware LBaaS v2 driver failure when trying to
delete LB instance witohut any members defined for its pools

Change-Id: I1e0fae729420a1193c29ac247f62c08b66270bd6
Closes-Bug: 1467243

gandelman-a/neutron-lbaas,gandelman-a/neutron-lbaas,gandelman-a/neutron-lbaas