lib: Move string and util helpers to library

It's not yet needed in main wrapper.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
test: Add trivial sleeping program for testing

I'll drop it out later.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Add collecting/freezing functionality

Now we can seize tasks and threads.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>