Add support for diff overrides in handle_updates; fix updating default_firewall_ids when None#731

lgarber-akamai merged 7 commits intolinode:devlinode/ansible_linode:devfrom

lgarber-akamai:fix/firewall-settings-update-nulllgarber-akamai/ansible_linode:fix/firewall-settings-update-nullCopy head branch name to clipboard