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Include <getopt.h> in various utilities
re: #2303
As noted, some utilities are using getopt() without including
getopt.h, so add as needed.
Turn off run_diskless2.sh when ENABLE_PARALLEL is true
re: #2315
Ed notes that this test hangs when running parallel. The test
is attempting to create a very large in-memory file, which is
the proximate cause. But no idea what's the underlying cause.