This commit updates the uct btl to support the v1.6.x release of
UCX. This release breaks API.
Signed-off-by: Nathan Hjelm <hjelmn@cs.unm.edu>
(cherry picked from commit b78066720c3e3299bd76f2e22d2c0e415db572fc)
Signed-off-by: Geoffrey Paulsen <gpaulsen@us.ibm.com>