LVM2 now provides device-mapper

- Updated LVM2 to version 2.02.47
- Added option to only install dmsetup
- Updated config description - thanks Olaf Rempel
- Fixed readline issues - thanks Olaf Rempel

Signed-off-by: Nigel Kukard <nkukard@lbsd.net>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>