lvm: Fix #3159: Show RAID LVs as storage content

LVM RAID logical volumes (including mirrors) can be valid disk images, so they
should show up in storage content listings (for example pvesm list).

Including LV types is safer than excluding, especially because of possible
additional types in the future.

Co-developed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Signed-off-by: Dominic Jäger <d.jaeger@proxmox.com>

PVE/Storage/LVMPlugin.pm

@@ -446,7 +446,8 @@ sub list_images {
 
 	    next if $scfg->{tagged_only} && !&$check_tags($info->{tags});
 
-	    next if $info->{lv_type} ne '-';
+	    # Allow mirrored and RAID LVs
+	    next if $info->{lv_type} !~ m/^[-mMrR]$/;
 
 	    my $volid = "$storeid:$volname";