Move CDN code to external abstraction

[agjohnson]

This adds a signal for listening as an external application, purging can be
performed on a project basis there.

[ericholscher]

This should remove the CDN code from inside RTD, as well.

[agjohnson]

Forgot that, updated.

[ericholscher]

Guessing this is blocked on deployment as well? Looks good otherwise.

[agjohnson]

It shouldn't on the community site at least, as there aren't any cdn users configured

[ericholscher]

Ah, True.

[ericholscher]

👍 on merging re: conversation above.

[berkerpeksag]

It seems like the 'maxcdn' entries in tox.ini and requirements/deploy.txt are not needed.

[agjohnson]

Need to get back to this and rebase, will need to double check that the pieces we need are in the extension + operations provisioning.

Marked as blocking for now

[agjohnson]

This is now unblocked and should be cleaned up.

[ericholscher]

@agjohnson anything specifically that needs to be cleaned up? I don't believe we currently have an CDN users, so this would be a good time to get it merged.

[ericholscher]

@agjohnson I'd be +1 on merging this now since we don't have any current CDN users, and we can confirm it works on the next setup we do.

[humitos]

@agjohnson is there anything else we need to do here?

It seems that we remove the purge function and now it's triggering a signal, but the signal is not connected --so, the old purge function / code is not being executed.