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.

tests: use cgienv to minimize environment setup at hgweb tests This patch follows other hgweb tests.

tests: avoid test failure for mangling path-like string by MSYS

py3: make sure commands name are bytes in tests

py3: add b'' to make the regex pattern bytes

py3: use hex() to convert the hash to bytes

py3: add b'' to make a triple quoted string bytes on Python 3 Transformer does not adds b'' in front of triple quoted strings to prevent converting docs to bytes.