Don't try to use sudo inside sshd log wrapper. We still need to

Don't try to use sudo inside sshd log wrapper.  We still need to
check if we're using sudo since we don't want to chown unecessarily,
as on some platforms this causes an error which pollutes stderr.
We also don't want to unnecessarily invoke sudo, since it's running
in the context of the proxycommand, on *other* platforms it may not
be able to authenticate, and if we're using SUDO then it should
already be privileged.