Don't enable debug messages by default.

Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>
Simplify invocations of remaining test cases.

Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>
Set correct kernel parameters for private memory zeroing test case.

Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>