Make 'missing export' a warning in test plugins, add missing ones

Make 'missing export' a warning in test plugins, add missing ones

In general, plugins export all their packages. For test plugins,
in can be useful to reuse existing tests to create test suite.
By exporting all packages, it makes this use case easier and it's
also more consistent.

Change-Id: If6c1ec7368dbfe3449db86d655d05f45f5af84ae
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/80173
Reviewed-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Tested-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Reviewed-by: Hudson CI