[MERGE][#220806] Define _remote_is_at_least_1_2 on SmartClientMedium base class, rather than just SmartClientStreamMedium.

[Andrew Bennetts]

This patch fixes <https://bugs.launchpad.net/bzr/+bug/220806>.  It turns out to
be essentially trivial: _remote_is_at_least_1_2 was defined on
SmartClientStreamMedium, but it should be defined on all SmartClientMedium
implementations.  So moving the definition of the attribute to the
SmartClientMedium base class fixes the bug.

-Andrew.

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