maintenaince mode confuses client
during an upgrade, the maintenance message shows up on any attempt to fetch a json from the provider api:
11058 ± : curl -k https://api.demo.bitmask.net:4430/provider.json Upgrade in progess hold on
Since this returns a 200, the processing keeps going, but chokes on finding non-json content.
If it's not too hard to do, I think some other error code (actually, 503 Service Unavailable) would be a better failure case from the client perspective.
(from redmine: created on 2016-02-16)