TEST: Try to fix gnome-terminal being all-black

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Wait a little longer until the Unix sockets have been created

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Warn very, very loudly when the user attempts to start without /shared/

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>