add net_blame.sh, which finds the top instances on a net node
add net_blame.sh, which finds the top instances on a net node

Change-Id: I18eee0818ff1e142013c932ca1ef2f2998599035

openstack/osops-tools-contrib,openstack/osops-tools-contrib,openstack/osops-tools-contrib,openstack/osops-tools-contrib