More expected tar unpacking
More expected tar unpacking

I.e. we don't set permissions on already created directories. This
allows to unpack archives that contain `/proc`, `/dev` and other system
directories (but not contents inside)

tailhook/vagga,popravich/vagga,tailhook/vagga,tailhook/vagga,popravich/vagga,popravich/vagga,popravich/vagga,tailhook/vagga