Receive capabilities may not be a subset of the endpoint capabilities.

[tmh97]

As of now, Cornelis's OPX abides by the libfabric manpage which states "The capabilities (rx or tx) must be a subset of those requested of the associated endpoint."

In the past we addressed this #1080, however I just realized that on line 1393 of src/transport_ofi.c https://github.com/Sandia-OpenSHMEM/SOS/blob/main/src/transport_ofi.c#L1393, we are still violating the libfabric manpages, which forces failure in OPX.

I'm hoping we can resolve this by:

• setting rx_attr->caps to info->p_info->caps
• setting rx_attr->caps to 0 or null (potentially not o.k. for a few other providers)
• any other suggestions that result in rx_attr->caps becoming a subset of the p_info->caps