Support starting and down appliances

[jesseolsen]

Support appliances that are in a starting state, or are offline (down).
Currently the bot will not start until a connection is established, and will fail on subsequent calls if the apliance goes down.

Currently, if you send a REST call to an appliance that is starting, you get:

$ curl -k https://16.125.73.152/rest/status/starting
{"errorSource":null,"nestedErrors":[],"errorCode":"ERR_CONTROLLER_STARTING","data":{},"recommendedActions":["Wait for the appliance to complete its startup, then resend the request."],"details":"Requests cannot be serviced while the appliance is starting up.","message":"The appliance is starting."}

This could be detected by the bot.