[*] Rootfs: Fix errors on copying missing files. Add collecting netstat statistics.

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] Rootfs: Increase keeping min_free_kbytes by kernel for stb850 (affect on v4l2 streaming)

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>