[PATCH] Fix CTDB PID file handling

[Martin Schwenke]

At the moment ctdbd_wrapper is solid but multiple ctdbd's can start at
the same time.  If they overtake each other in interesting ways then
one ctdbd can exit early and remove another's PID file.

Add a PID file abstraction, use it, make PID file creation the first
action, clean up some surrounding code.

Please review and maybe push...

peace & happiness,
martin
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