Use execution_space in Kokkos::parallel_ and Kokkos::deep_copy

Arndt, Danielrequested to merge
github/fork/masterleinad/fix_distributed into master

Created by: masterleinad

In particular, this should deal with Distributor. The cases that don't work yet are marked (most likely due to the bug reported by @dalg24 in Kokkos).

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