First pass to make bluhm@ happy regarding doas regress conf.

First pass to make bluhm@ happy regarding doas regress conf.

1. Make permit tests use wsrc instead of wobj (because basically, to run
   test you need obj being writable, unless you want to pollute /usr/src);
2. Test if current user is in wobj group prior running the test, and skip
   the test if he is not.