Remove utf-related restrictions files from `common`

[aaaaalbert]

The unit tests run via ´utf´, the Seattle unit test framework, require special resource restrictions files for various tests (e.g. to see whether the restrictions are actually enforced, or to allow a large number of sockets, etc.).

These restrictions files should be part of utf however, not common. A (probably very generous) default restrictions file should be included in the repy_v2 directory to make that a reasonable runtime environment.