also start removing ssg references from swim code

- focus on verbs;ofi_rxm stack for now

- problematic issue has been fixed in libfabric repo

- just keeping in git as a debugging hack to keep time calls from
  showing up in profiles

- no significant perf change with this or preceding cache mode changes, but
  including for completeness

- mislabeled ofi/verbs results as ofi/psm2

- not included in nightly tests yet, requires use of evaluation nodes
  that aren't in production
- tests run cleanly but bandwidth is slow

- experimental, just for benchmarking

- current origin/master seems unstable for psm2 in libfabric

- add bw tests
- switch cci tests to busy-spin only