With the new dial-stdio command the dialer is split
from `Client` function in order to access it directly.

This breaks the custom connhelpers functionality
as support for connhelpers is a feature of the default
dialer. If client defines a custom dialer then only
it is used without extra modifications. This means
that remote driver dialer needs to detect the
connhelpers on its own.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>