raw.py: switch to the BmapCreate module

raw.py: switch to the BmapCreate module

The bmaptools project now has a nice 'BmapCreate' API module, which contains
all the bmap creation functionality, gets improved and bug-fixed, as well as
tested.

Already now it is better then the old mic implementation because it uses the
FIEMAP ioctl instead of FIBMAP, and FIEMAP does not require root.

In order to get all the goodies of the library and avoid code duplication
and double maintanace efforts - switch to the BmapCreate library and kill
own bmap implementation.

Change-Id: Ie5b591fd1125dcff3fb82118a6e3604961e9c301
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>