Start hooking up password device policies

This introduces a new activity for changing the password, which takes
care of launching the correct password activity based on the caller's
request and active policy.  The security settings activity now uses
this, and it implements the API action for launching the password UI.

src/com/android/settings/ChooseLockPatternTutorial.java

@@ -36,7 +36,7 @@ public class ChooseLockPatternTutorial extends Activity implements View.OnClickL
         LockPatternUtils lockPatternUtils = new LockPatternUtils(this);
         if (savedInstanceState == null && lockPatternUtils.isPatternEverChosen()) {
             Intent intent = new Intent();
-            intent.setClassName("com.android.settings", "com.android.settings.ChooseLockPattern");
+            intent.setClass(this, ChooseLockPattern.class);
             startActivity(intent);
             finish();
         } else {