[Pm-utils] lockfile creation not really atomic in pm-utils

[Victor Lowther]

While browsing through the source of pm-utils, I noticed that the
lock/unlocking functions were using file creation/removal and PID
checking for locking purposes.  In a shell scripting language,
however, there is no way to atomically create files.

Directory creation, however, is atomic.  Here is a patch to atomicize
the lock/unlick functions.
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