lttng: Add time alignment work to scatter chart

lttng: Add time alignment work to scatter chart

Removes adjustRange() on the X-axis because it can change the desired
range when no data point exists at the range bounds.

Changes TmfCommonXLineChartViewer to use X-axis range for time alignment
instead of first and last data points.

Change-Id: Ia15eff9a258da0b20d0204c25f003768adc6b5e0
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/57011
Reviewed-by: Hudson CI