The 'unicode_key_value_to_string' and '_encode' helpers were used to
handle the difference between unicode and byte strings in Python 2. In a
Python 3-only world, they are unnecessary. Remove them.
Some references to text encoding in the HACKING file are removed. In
theory, we should no longer have to worry about byte strings.
Change-Id: I0694b25dc4d72e817cb08ce6cafb39bb8226293d
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
0002625e2b