Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Integrate tools/regression/fifo into the FreeBSD test suite as tests/sys/fifo
and tools/regression/file into the FreeBSD test suite as tests/sys/file

MFC after: 1 week

Teach fifo_create regression test to also try to use mknod(2) to create
fifos, as this is required by the Single UNIX Specification, although
not currently implemented on FreeBSD.

While here, fix a

Teach fifo_create regression test to also try to use mknod(2) to create
fifos, as this is required by the Single UNIX Specification, although
not currently implemented on FreeBSD.

While here, fix a bug in the directory timestamp checking test by
sleeping after querying the starting timestamp, rather than before.

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Add fifo_create, a simple regression test for mkfifo(2).