Changes

Bug 572889: Remove LEGACY from jenkins file after dropping older targets

Also remove jenkins file for Java 8 build.

Change-Id: I5dab18a127b342355f2398d09dc22a77349d0072
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>

Remove Legacy* flags from incubator jenkins file used for older targets

see Bug 576767

This is not needed anymore since older targets before 4.16 are not
supported anymore.

Remove Legacy-server-2020-06, because it's not needed anymore because
there is a separate 2020-06 branch that takes care of building for that
target.

Change-Id: I750870734f03f7c5fc417b4378e17f17ff3de258
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>

Bug 576767: releng: Remove older targets before 4.16 (2020-06)

Change target tracecompass-incubator-master.target to build for 2020-06
and remove the following target files:
- tracecompass-incubator-oxygen.target
- tracecompass-incubator-2019-06.target
- tracecompass-incubator-2020-06.target

Update relevant pom.xml files for that.

Change-Id: I034e7828b6db91f98490f975585b7b83cd0f2700
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/187747
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>