gdm: move all login/unlock code to auth/ directory

Right now the GDM and unlock code use a mish-mash of files
from ui/ and from gdm/.

This commit consolidates all the files into ui/auth as a
first step toward cleaning up the duplication of code between
the two features.

js/ui/auth/fingerprint.js

@@ -0,0 +1,26 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
+const Gio = imports.gi.Gio;
+const Lang = imports.lang;
+const Shell = imports.gi.Shell;
+const Signals = imports.signals;
+
+const FprintManagerIface = <interface name='net.reactivated.Fprint.Manager'>
+<method name='GetDefaultDevice'>
+    <arg type='o' direction='out' />
+</method>
+</interface>;
+
+const FprintManagerInfo = Gio.DBusInterfaceInfo.new_for_xml(FprintManagerIface);
+
+function FprintManager() {
+    var self = new Gio.DBusProxy({ g_connection: Gio.DBus.system,
+                                   g_interface_name: FprintManagerInfo.name,
+                                   g_interface_info: FprintManagerInfo,
+                                   g_name: 'net.reactivated.Fprint',
+                                   g_object_path: '/net/reactivated/Fprint/Manager',
+                                   g_flags: (Gio.DBusProxyFlags.DO_NOT_LOAD_PROPERTIES) });
+
+    self.init(null);
+    return self;
+}