tee: try opening as a UNIX socket if open(2) fails

If we get EOPNOTSUPP from open() failing, then it may just be that we're
looking at a unix(4) socket instead of a normal file/device or whatnot.
Fa

tee: try opening as a UNIX socket if open(2) fails

If we get EOPNOTSUPP from open() failing, then it may just be that we're
looking at a unix(4) socket instead of a normal file/device or whatnot.
Fallback to trying to open it as a unix(4) socket, which is a useful
feature that doesn't add much complexity.

Reviewed by: des, emaste, markj
Differential Revision: https://reviews.freebsd.org/D48197

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tee: add some basic tests

The cases are ordered in such a way that we naturally progress through
the functionality, with the earliest failures perhaps shedding light on
any later failures.

sysutils

tee: add some basic tests

The cases are ordered in such a way that we naturally progress through
the functionality, with the earliest failures perhaps shedding light on
any later failures.

sysutils/porch is used for one test if it's available, just to cleanly
check that SIGINT is being ignored properly.

Reviewed by: des, emaste
Differential Revision: https://reviews.freebsd.org/D48195

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