missing-files: Comply with new configuration policy

New properties

missing-files.cell.name
missing-files.cell.export
missing-files.plugins
missing-files.limits.threads
dcache.service.missing-files
dcache.service.missing-files.timeout
dcache.service.missing-files.timeout.unit
dcache.enable.missing-files

Deprecated

missing-files.plugin.list
missing-files.thread-count
missing-files.name
missing-files.timeout
missing-files.timeout.unit
missing-files.enabled

Target: trunk
Require-notes: yes
Require-book: yes
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/5741/