admin/dna/install_from_url

[mjbrisebois]

I think this would be a useful endpoint. There are several scenarios where you can be administrating Conductor without being local (eg. HP Admin).

Since DNAs can only be installed from a local file, it requires a separate service just for downloading the DNAs. expected_hash should be non-optional for this method.

[jamesray1]

[F8-enhancement][M4-hdk][P7-nicetohave][post-1.0]

[zippy]

Note, this already partially support by #1830 which allows specifying the DNA by URL. But there was also merge snafu that deleted a bunch of code that uses this in the remote-dna-location so this is on the backlog and @maackle was going to look at it at some point.