Give real message when status is not OK in DownloadManagerTest

Current "OK" message is totally meaningless

Change-Id: Ifd104fa3de7234d1a4cd9580e143f69acb709a22
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/equinox/rt.equinox.p2/+/186262
Tested-by: Equinox Bot <equinox-bot@eclipse.org>
1 file changed