version error on incorrect machine in cfg

[Christian-B]

With a bad cfg:
[Machine]
machineName =SpiNNaker1M
version = None

spinn_machine.exceptions.SpinnMachineException: cfg [Machine]version {version} is None

Should be a composite error which point to the machine too

[Christian-B]

a bad spalloc server value:
[Machine]
spalloc_server = https://:@spinnaker.cs.man.ac.uk/spalloc/[mailbox.org]
spalloc_port = 22244

gives the error
spinnman.exceptions.SpallocException: could not establish temporary session

[Christian-B]

Any error on logging except the standard missing cfg file one should include a printout of the cfg values being attempted