alloc-stress: memcg fixes and additional tracing option

Fix memcg paths according to the latest memcg mount points, print
children PIDs for easy tracing and add an option to trace lifetime
of the children.

Change-Id: Iced821ef28b6c36598ca872a7115738b813baa90
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
1 file changed