Do not scan transitive dependencies

Doing so pulls in aries, which is provided by karaf, causing reactivation
of the platform, breaking pax-exam tests. This fixes the issue partially,
as blueprint is not being directly reactivated.

This is true for odl-mdsal-broker-local and odl-mdsal-xsql. Also the sample
test app should not be pulling tycho into an OSGi container, make sure the
dependency is only for test.

Change-Id: I5b08e19e39347fe6e5c03bf6dbe1cb05e36274e3
Signed-off-by: Robert Varga <rovarga@cisco.com>