service: More logs on disconnect

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
phaul: Introduce layer for hauling helpers

We can haul different thing. E.g. ovz container, lxc or docker one,
and individual processes. Maybe more. Each type has its own specific
in how to identify it, how to migrate FS and how to prepare/cleanup
it on destination/source nodes.

The ph_type thing is about that -- it provides necessary callbacks
for the described above things.

As an example introduce a simple PID hauler.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
ovz: Initial version of OpenVZ containers hauler

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
test/mtouch: Update HOWTO according to new syntax and output

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>