vgimportdevices adds PVs from a VG to the devices file.  This is similar
to using using lvmdevices --adddev to add each PV to the devices file
individually.  vgimportdevices will also update the VG metadata to include
the device IDs of each PV.  vgimportdevices will create a new devices file
if none exists.
.P
When a devices file is used, the regex filter is ignored, except in the case
of vgimportdevices which will apply the regex filter when looking for the VGs
to import to the devices file.  Use vgimportdevices -a to import all VGs on a
system to the devices file.