remove test-jar from new tools-api artifact

remove test-jar from new tools-api artifact

This is not needed here, and before anyone creates a dependency to the
new (empty) attached test artifact by mistake, should be removed to
avoid any confusion.

A test-jar is only required if we need to publish src/test on Nexus.
This project does not even have a src/test; and even if it did, we would
only ever have tests for tools-api in it, not test utilities which other
projects would use - because we have the tools-testutils for that,
instead.

Change-Id: Ie1a3152386fee538eb812d52985a3ac17db8520b
Signed-off-by: Michael Vorburger <vorburger@redhat.com>