Current linaro-android-media-create has an unnecessary dependency on debian.debfile

[Bernhard Rosenkraenzer]

Android doesn't have a need to parse deb files -- but currently, linaro-android-media-create on a box that doesn't have the tools for deb file handling installed results in

Traceback (most recent call last):
  File "./linaro-android-media-create", line 28, in <module>
    from linaro_image_tools.media_create.android_boards import (
  File "/home/bero/linaro-image-tools-2012.10/linaro_image_tools/media_create/__init__.py", line 25, in <module>
    from linaro_image_tools.media_create.boards import board_configs
  File "/home/bero/linaro-image-tools-2012.10/linaro_image_tools/media_create/boards.py", line 40, in <module>
    from linaro_image_tools.hwpack.builder import PackageUnpacker
  File "/home/bero/linaro-image-tools-2012.10/linaro_image_tools/hwpack/builder.py", line 30, in <module>
    from debian.debfile import DebFile
ImportError: No module named debian.debfile

This makes it unnecessarily complicated to work with linaro-android-media-create on systems that aren't Debian based.

[Milo Casagrande (milo)]

Obviously we cannot remove the package dependency on python-debian, but it should be possible to refactor the code so that at least that part should be usable on non-Debian distro (using l-i-t from source code). It might involve a little bit of moving things around.

[Milo Casagrande (milo)]

The linked branch should solve this problem when using l-i-t from source. I only tested launching 'linaro-android-media-create' from the command line, not yet with a full execution.