importing an existing firmware signing key fails

[ConnorRigby]

if you upload or create a key, and then export it to give to someone else, and try to import it, it will succeed, but give an error from the API when trying to upload it to nerves-hub

Unhandled error: {:error, %{"errors" => %{"name" => ["has already been taken"]}}}

[fhunleth]

Closing since I imported the key and didn't tell you quick enough.