* Created Striker->get_fence_data() that reads/parses the unified fence metadata file created by tools/striker-parse-fence-agents.
* Created the new 'fences' database table and Database->insert_or_update_fences() to handle it.
* Added hosts -> host_ipmi that will, later, store information on how to access the host's IPMI interface, when available.
* Sketched out how the new Install Manifests are going to work.
Signed-off-by: Digimer <digimer@alteeve.ca>