High: fencing: Fence using all required devices
High: fencing: Execute all required fencing devices regardless of what topology level they are at
High: fencing: default to 'off' when agent does not advertise 'reboot' in metadata
Low: fencing: move nodeid regression test requirements to fence_dummy
Low: fencing: remove duplicate test cases
Low: fencing: regression tests for automatic unfencing
Low: fencing: regression tests for required devices in topology
Low: fencing: default reboot to off regression tests
Merge pull request #505 from davidvossel/unfence-tests

logic for unfencing required fencing devices