PATCH: Replace mlockall() with interal implementation

[Zdenek Kabelac <zkabelac@redhat.com>]

3rd version of mlockall() replace.

Fixing some comments:

- new text for lvm.conf
- using '1' for success for _maps_line
- checking sscanf ret value
- moved default string values to const char array in front of the source code.
- added simple statistic for size of locked areas and issue internal error
  if the size is different for mlock/munlock
- add some more libs to list of unlocked maps - (though some checks are still
  needed here.
- slightly changed debug output.

Zdenek
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