Run dist-tests
with different WASM VMs
#757
Merged
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The goal of this PR is to make the distributed tests run on WAMR. The motivation behind it is that WAMR migration was broken, and we never realised because the distributed tests were running only with WAVM. This is also helpful to run the MPI distributed tests on WAMR.
Other than MPI, the distributed tests also exercise access to state, and threads. In this PR I only implement the former, and leave threads/OpenMP with WAMR for a future PR.