Fix: add test UST perf to extra dist

Signed-off-by: David Goulet <dgoulet@efficios.com>
Fix: disable JUL event on UST side

With the new root logger patch in liblttng-ust-jul, we have to disable
the JUL logger on the UST tracer side for the multi session support.

Signed-off-by: David Goulet <dgoulet@efficios.com>
Test: add JUL disable event tests

Signed-off-by: David Goulet <dgoulet@efficios.com>
Update version to v2.5.0-rc2

Signed-off-by: David Goulet <dgoulet@efficios.com>