print warning about in-use orphans

print warning about in-use orphans

Warn about a PV that has the in-use flag set, but appears in
the orphan VG (no VG was found referencing it.)

There are a number of conditions that could lead to this:

. The PV was created with no mdas and is used in a VG with
  other PVs (with metadata) that have not yet appeared on
  the system.  So, no VG metadata is found by lvm which
  references the in-use PV with no mdas.

. vgremove could have failed after clearing mdas but
  before clearing the in-use flag.  In this case, the
  in-use flag needs to be manually cleared on the PV.

. The PV may have damanged/unrecognized VG metadata
  that lvm could not read.

. The PV may have no mdas, and the PVs with the metadata
  may have damaged/unrecognized metadata.