Fix BlockDevices to report in-use vs not-in-use
Fix BlockDevices to report in-use vs not-in-use

Check to see if it contains any linear devs and set the status field
appropriately. We still don't implement "Bad"... I'm not sure where we
would figure that out. dm status of raids on it, perhaps?

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

agrover/froyo