Fix: send disable ALL command code if event is *

$ lttng disable-event -a
and
$ lttng disable-event '*'

Both commands should do the same meaning send the DISABLE_EVENT_ALL
command to the session daemon.

Signed-off-by: David Goulet <dgoulet@efficios.com>
Fix: disable event for JUL domain

This fix could not be backported from master since it has changed too
much but the ref. is 0dcfcf94b356c12e3936fa27f350896d96724e4e on the
master branch.

This fixes the disable event command that was not working with the JUL
domain and adds a test for it.

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