D3954: mail: cope with Py3 unicode antics on email addresses

[Yuya Nishihara]

> -    return email.utils.formataddr((name, addr))
> +    return pycompat.bytesurl(
> +        email.utils.formataddr((name, addr.decode('ascii'))))

Maybe this would bring unicode to Python 2.

>  def addressencode(ui, address, charsets=None, display=False):
>      '''Turns address into RFC-2047 compliant header.'''
>      if display or not address:
>          return address or ''
> -    name, addr = email.utils.parseaddr(address)
> +    name, addr = email.utils.parseaddr(pycompat.strurl(address))

strurl() is too strict to convert a user input. `encoding.strfromlocal()`
can be used instead.

>      result = []
> -    for name, addr in email.utils.getaddresses(addrs):
> +    for name, addr in email.utils.getaddresses(
> +            [pycompat.strurl(a) for a in addrs]):

Same here.