Add support for cloudflare source in loadbalaner firewall rules

[reubit]

Description

Add support for cloudflare source in loadbalaner firewall rules

Related Issues

Addresses #102

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

[reubit]

@vultj @happytreees @ddymko Just flagging you guys for review.

Thanks! 🙂

[optik-aper]

This looks sane to me and tests work locally. @reubit If you wouldn't mind resolving the gofmt error we can merge this.

vultr/loadbalancer_test.go:95: File is not `gofmt`-ed with `-s` (gofmt)
			Name:        "lb-name",
			Namespace:   v1.NamespaceDefault,
			UID:         "lb-name",

[reubit]

Thanks @optik-aper. Just pushed the gofmt fix. Apologies for that!

[reubit]

@optik-aper **Nudge**

Just a gentle reminder to approve the workflows when you've got time.

Would be great to see this merged and included in the next VKE upgrade!

Thanks! 🙂