[PATCH] CTDB PID file fixes (bug 12287)

[Martin Schwenke]

3 patches to improve CTDB PID file handling in ctdbd_wrapper.

The 1st patch is an additional patch for bug 12287, so will be
backported.

The others can just go into master and won't need a backport.

Please review and maybe push...

peace & happiness,
martin
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