clang format

[jjts]

why do we have that at the root? can it go to py2?

[P-Miranda]

Usually the .clang-format file is in the directory from where the clang-format command is called.
But is also possible to use a .clang-format from other path with the command:

clang-format --style=file:./path/to/config/.clang-format -i <files-to-format>

We can add the .clang-format file to py2 and update the clang-format command executed in py2hwsw/scripts/sw_tools.py accordingly.

This will remove the need to have a .clang-format at the root of every repository,
but also the possibility to have different format styles for each project (which I don't think we need for now).