analysis.io: Provide information from the IO model

analysis.io: Provide information from the IO model

This extracts a base Disk class from the DiskWriteModel, that can be used
by outputs and views to get data from the analysis.

It also adds an Information Provider for the input output analysis module

It comes with its units tests

Change-Id: Iffb8428eb161bbd5cfcb834deebfa55d812f4d00
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/69669
Reviewed-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>