remove SMBFS and nsmb/netsmb - userland part

branches: 1.1.2;
Split out /rescue to its own set and adapt installers/images to add it.

This is meant to make updates safer: if something goes wrong with updating
base, we still have the old, standalone /rescue to recover from.

Split out /rescue to its own set and adapt installers/images to add it.

This is meant to make updates safer: if something goes wrong with updating
base, we still have the old, standalone /rescue to recover from.