- pass field_mask to ucp_init().
- use non-blocking disconnect.
- recv() with pre-allocated request.
- call opal_progress() from iprobe() and improbe().
- use shift pattern in connect/disconnect.
* Remodel the request.
Added the wait sync primitive and integrate it into the PML and MTL
infrastructure. The multi-threaded requests are now significantly
less heavy and less noisy (only the threads associated with completed
requests are signaled).
* Fix the condition to release the request.
We should invoke OBJ_CONTRUCT/OBJ_DESTRUCT only on regular requests
(which are embedded inside UCX requests) and for the completed request.
Persistent requests are already constructed/destructed by the free list.
This fixes an assertion in ompi_request_destruct.
