Ininitial roundup of 1.2.0 release items

- Add support for RoCE
- Add support for On Demand Paging
- No longer assume that no driver for a verbs device should be considered
  an error condition (usnic devices in particular are moving to libfabric
  drivers only, so we will emit a useless warning/error in the presence
  of usnic enabled machines)
- Harden some of the argument processing in example programs
- Add support for s390x
- Fix the broken create/destroy flow API
- First release under new management (hence the decision to update to
  version 1.2.0 instead of 1.1.9)
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