When a server provision job is started, create an empty tile

[digimer]

The idea is to give the user an indication more quickly that their server is being provisioned. So the tile that gets created when the server boots, have that appear as soon as the anvil-provision-server job is registered with some sort of icon showing the user that the server will be available shortly. Perhaps show the anvil-provision-server job_percentage?

[digimer]

Additional to this; there is a bug where where the first creation of the tile shows a broken screenshot URL. I wonder if it tries to take a screenshot before the server actually exists / boots?

[digimer]

Extension to this; When a job to shutdown the server is registered, the server's tile should have a "shutting down..." overlay. Once the DB shows the server is stopped, the last screenshot should be removed with the "server is off" overlay.

[ylei-tsubame]

To find server(s) that are pending, get the provision server job that:

1. doesn't have a server name that exists in the servers table,
2. doesn't have peer-mode(?) enabled

[ylei-tsubame]

The shut down indicator is tracked in #767. This issue should only track the provision indicator.