Slave errors must NOT stop processing of other slaves

I know, it's an ugly commit, my bad.

Anyway if http is not allowed, apache will redirect to https.

Assume there is iproutes redirection from port 80/443 to port defined in instance (so public port is 80/443).
Frontend has to be reachable from defaults ports, otherwise it has no sense.

Reverts the effects of 8dba9b27 but keep cleanup

Correct default software_type to RootSoftwareInstance.
Was: RootInstanceSoftware.