test: set descriptor and log level for the libct log engine

Signed-off-by: Andrey Vagin <avagin@openvz.org>
make: clean all libraries

Signed-off-by: Andrey Vagin <avagin@openvz.org>
go: add SetLSMLabel

Signed-off-by: Andrey Vagin <avagin@openvz.org>
test: make host mounts as slaves in a test mntns

We don't want propagate test mounts into the host mntns.
test: rework test loging functions

Signed-off-by: Andrey Vagin <avagin@openvz.org>