Upload log database to spalloc when using

[rowleya]

Once spalloc supports uploading of data (see SpiNNakerManchester/JavaSpiNNaker#1217), add a call here to do the upload

[Christian-B]

Ideally the upload would happen after the create job request has been started.

There is time between that and when the job hs been allocated boards and these are ready.

[rowleya]

In some ways it doesn't matter; once a job has been established, the log database can be attached regardless of when the boards are actually allocated. The log data will just be stored ready for use when requested; this won't be possible until the board is at least booted anyway, and won't be useful until something has actually run and written to IOBUF of course!