fix #1405: sort pci ids by functions

QemuServer::lspci() iterates over /sys/bus/pci/devices which
doesn't guarantee any order which means functions sometimes
ended up in the wrong order and it was never clear which
one would get the additional options such as x-vga passed
to them.

PVE/QemuServer.pm

@@ -6304,6 +6304,12 @@ sub lspci {
 	    push @{$devices->{$id}}, $res;
     });
 
+    # Entries should be sorted by functions.
+    foreach my $id (keys %$devices) {
+	my $dev = $devices->{$id};
+	$devices->{$id} = [ sort { $a->{function} <=> $b->{function} } @$dev ];
+    }
+
     return $devices;
 }