analysis.lami: Split axis titles in label and units

analysis.lami: Split axis titles in label and units

The axis titles are now built using the label and units strings,
which makes it easier to override or remove the units of an axis.

Bug: 493941

Change-Id: Icd63f9678084029c6ccaf2a6c51b607ccc71c0ab
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-on: https://git.eclipse.org/r/74092
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-by: Hudson CI
Reviewed-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Tested-by: Alexandre Montplaisir <alexmonthy@efficios.com>