Add open_to_operation, a security regression test that opens files with

various open flags and then tests various operations to make sure that
they are properly constrained by open flags.  Various I/O mechansms
are tried, including aio if compiled into the kernel or loaded as a
module.  There's more to be done here but it's a useful start, running
about 220 individual tests.

This is in support of FreeBSD-SA-08:03.sendfile.

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