[ofiwg] provider feature matrix

[Dave Goodell (dgoodell)]

Another good pre-1.3-release task for provider maintainers would be to update the provider feature matrix:

https://github.com/ofiwg/libfabric/wiki/Provider-Feature-Matrix

If you get some time as we approach the release, please update the columns for your respective providers.  Optionally, we also could archive the current state to indicate support as of the 1.2.1 release, though I'm not sure how often users/developers will need such historical information.

-Dave