When building a VG from textmap, try to determine LV's devnos
When building a VG from textmap, try to determine LV's devnos

DM may know, so call list_devices and try to match LV names with devnos.

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

agrover/melvin