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Merged
Created by Philip Carns@carnsOwner

refactor provider multiplexing

This PR breaks the Margo api; need to coordinate merge with other sds repos if accepted.

API changes:

  • mplex/MPLEX -> provider/PROVIDER to reflect that we think of these as provider identifiers now
  • removes margo_set_target_id() in favor of *forward() variants that let you specify provider_id
  • replaces margo_lookup_mplex() with margo_hg_handle_get_handler_pool() for cleaner code path in handler (pool is looked up straight from rpc id)

Internal changes: Doesn't use target_id field in Mercury handle anymore, but instead integrates provider_id into a portion of the hg_id_t handle space. This will work better when Mercury PR lands that increases hg_id_t to 64 bits, but won't change any logic here, as margo just takes 1/4th of handle space for provider_id regardless.