releng: Use non-composite repository for Derby

releng: Use non-composite repository for Derby

This speeds up the build time by having to do less http requests.
The improvement is even greater when contacting the server gets
occasionally very slow when building on eclipse.org slave.

Change-Id: Idfda43ade332bc61fad11df30810c948391f6407
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/73122
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>