py3: pass the memoryview object into bytes() to get the value

py3: use pycompat.bytestr instead of str

py3: use '%d' to convert integers to bytes

py3: slice over bytes to prevent getting it's ascii value

py3: use pycompat.strkwargs() to convert kwargs keys to str

py3: use r'' to prevent the addition of b'' by transformer There are cases in opts handling in debugcommands.py where we don't need to convert opts keys back to bytes as there are some handful cases and no other function using opts value. Using r'', we prevent the transformer to add a b'' which will keep the value str.

py3: use pycompat.byteskwargs() to convert kwargs' keys to bytes This is used where ever required like where kwargs are passed into ui.formatter(), scmutil.match() or cmdutil.openrevlog() which expects bytes.