py3: use r'' to access values from kwargs where keys are str These are the cases where either args is again passed as keyword argument or 1 or 2 elements are accessed. So it's better to add an r'' to prevent it converting to bytes rather than doing the conversion of args.

py3: convert keys of kwargs in template keywords functions to bytes This patch converts the args argument keys' to bytes wherever necessary as there are some places where either args is not used or using r'' is better or args is again passed as keyword arguments.

py3: make sure the commands name are bytes in test-devel-warnings.t

py3: replace str with bytes in isinstance() We were using str because on Python 2, str were bytes but now we have to use bytes. Otherwise the if conditions fails and we have weird results from commands on Python 3.