Mark STF device as unhealthy if we cannot reserve device with status 0

[akamarouski]

[akamarouski]

Added logic that mark device as unhealthy, but cannot reproduce such status

[akamarouski]

For testing let's try to change device status in RethinkDB

[akamarouski]

Could not open RethingDB UI and change device state to 0

[dhreben]

Will be tested on production