Do not redirect to / in status.in/err test.

[gyakovlev]

Description

I was running fish test and this is the only test failing under sandboxed environment Gentoo linux uses during build/test process.
It does not allow to write outside of sandbox so >/ redirect is failing.
Trying to redirect something to / looks a bit scary,
redirect to current directory looks safer and does not try to escape sandbox.

TODOs:

• Changes to fish usage are reflected in user documentation/manpages.
• Tests have been added for regressions fixed
• User-visible changes noted in CHANGELOG.md

[krader1961]

Trying to redirect something to / looks a bit scary

No more than trying to open any directory for writing, including . (CWD). If your OS allows you to do that rather than return an error condition then your OS is badly broken. It doesn't matter if its root or the CWD. Having said that it doesn't really matter what directory we open since all we're verifying is that fish correctly handles the error indication the OS returns. The CWD works fine for that purpose so I'll merge this.