btl/uct: restrict to using UCT 1.7 or older API for now #7142
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related to #7128
The UCX crew is no longer guaranteeing that the UCT API is going to be frozen, so this is kind of a whack-a-mole problem trying to keep the BTL UCT working with various changing UCT APIs.
Signed-off-by: Howard Pritchard [email protected]