regress tests shouldn't set or modify MALLOC_OPTIONS unless they're actually very specific behaviour

document this accordingly in the guidelines section of the manpage

ok bluhm@

If the user running doas regress is not in the wobj group, switch
to the build user. This allows to run doas with a suitable user
and tests pass when started as root.

Make doas regression tests that involve doas running use a non-nosuid
partition, or skip if it could not find a one.

thanks bluhm@ for valuable input

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

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.

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Add (currently failing) test for passing PATH via keepenv in doas.

Initial report by Ze Loff on misc@.

Make test names printed like other test suites do.

Import test suite for doas. Relies on recently committed command matching
functionlity with -C flag.