testsuite: don't wait for hooks in blacklisted-package

wait_for_hooks waits until /tmp/abrt-done file exist. The file is
created by 'notify' event and in case of this test the event is never
ran because 'post-create' event exits with 1.

However the test must wait until sosreport process finishes, otherwise
the detected problem still exists as abrtd might run sosreport event
before abrt-action-save-package-data event.

Signed-off-by: Jakub Filak <jfilak@redhat.com>