[PATCH] ctdb-tests: Don't use nc -d or -w options

[Martin Schwenke]

nmap-ncat is used in some distributions to replace netcat.  It has a
different meaning for these options.

We can get the same effect as the current combination of -d and -w by
piping a sleep process to nc.  Subsequent use of $! works because it
gets the last process in pipeline.

Note that redirecting from /dev/null doesn't work with some versions
of nc.  They just exit when they get EOF.

Please review and maybe push...

peace & happiness,
martin
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