Rename cluster options with "stonith" in their name, and the `stonith-timeout` fence instance attribute, to use some derivative of "fencing" instead (for example, `stonith-enabled` to `fencing-enabled`, and `stonith-max-attempts` to `max-fence-attempts`).
* API commits to add constants for the new names
* Add the new cluster option names to `cluster_options[]`, moving the old names to `alt_name` (also replace "orphan" with "removed" in the descriptions)
* Update the code to accept either name for `stonith-timeout`
* API commits to deprecate the old constants
* Update comment, logs, and documentation that refer to the old names