Python2 is announced to be unmaintained from Jan 2020.
KIWI supports Python 2.7 and it should not support any python version that
is not maintained upstream. This Fixes#1036
This commit adds a stderr_to_stdout option to Command.run method to
redirect stderr to stdout.
Additionally this commit also includes to the debug log the dracut
call output, including both, stderr and stdout.
Fixes#1114
In case of a literal decoding failure it tries to decode
the result in utf-8. This is handy in python2 environments where
python and the host might be using different charset configurations.
In python3 this issue seams to be solved.
Fixes#829 and bsc#1110871
