add artifactory remote state storage

[lusis]

This PR adds support for using Artifactory as a remote state endpoint.
Artifactory can act as a generic HTTP endpoint but most artifactory installs require authentication and, when in non-anonymous mode, do not support challenge for auth.

Artifactory also supports additional (though not yet exposed here) metadata on files and also publishes checksums of files in the headers (which is nice)

Many shops tend to use artifactory as the source of truth for EVERYTHING (we do) so storing state there makes a ton of sense.

[jen20]

Hi @lusis! Thanks for submitting this, and sorry for the delay on reviewing it. I have the open source version of artifactory configured locally in a Vagrant box, but it's not at all clear which type of repository must be used in order for this to work, or whether it is even possible with the open source version of Artifactory. Could you confirm?

[lusis]

@jen20 With the opensource version I don't think it's possible to verify. You would want to create a "generic local repository":

https://www.jfrog.com/confluence/display/RTF/Configuring+Repositories#ConfiguringRepositories-GenericRepositories

Under "Admin" you can create a "generic repo" if it's listed and just set the key and hit save. That's the minimal amount of effort required.

[jen20]

Hi @lusis, I've merged this - thanks for your work!

[ghost]

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