V1.1.x SCHEDULE: fixes race on n_deps_satisfied #618
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A task can depend on 2 other tasks (e.g. from another frag of of
schedule and prev task in a given frag). In that case when those 2
frags a progressed by mutliple threads ucc_dependency_handler may
be called concurrently which results in a race on n_deps_satisfied.
(cherry picked from commit b8c78d8)
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V1.1.x of #616