Fix problem flaged by the compiler.
Added shm_open(2) test scenario.
Added "FAIL" to a failed test and include a "ls" of the two files used.
Added test scenario that exercise the highest syscall numbers, using
syscall4.sh
One more sendfile(2) scenario.
Added sendfile(2) scenario based on a PR.
Added a tmpfs scenario based on a PR.
Added general purpose UFS with SU test scenario.
Added a new TCP test scenario.
Added regression test for a nullfs vnode reference leak in
nullfs_reclaim_lowervp(). Fixed in r250505.
Added regression test for page fault seen in fifo_close().
Problem fixed by r250505.