It's quite boring to add your test to .gitignore and one may forget
to do that boilerplate -- put this labour on computer.
For that I make real targets for tests instead of implicit and
add test's binary name to .gitignore on make stage.
Also added *.pidns to .gitignore -- do not wanna do this as separate
trivial patch.

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>