pid files cleanup take 2

Hi all,

this new patch moves create_lockfile to dm_create_lockfile (dm-file.c), addresses the return code issue and switch also dmeventd to use the generic implementation.

autoreconf executed on F-12.

NOTE: dmeventd has, in its current implementation, a slightly more detailed error handling of the pid file. See the 2 return codes that are not necessary any longer by using dm_create_lock.
If current behavior of dmeventd has to be retained, then we can simply modify dm_create_lockfile to return different values depending on the error and dmeventd can simply re-map them for its needs.

Cheers
Fabio
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