Refactor passwords/pins/patterns to byte[]

Relating to packages/apps/Settings

Bug: 120484642
Test: manual - test setting and unlocking passwords/pins/patterns.
      automated - 20 of about 500 tests fail due to fragile synthetic
      password test code.

Change-Id: Idec8338d141c185bef67ade12035fdb2fa9d17ea

tests/robotests/src/com/android/settings/testutils/shadow/ShadowLockPatternUtils.java

@@ -66,12 +66,12 @@ public class ShadowLockPatternUtils {
     }
 
     @Implementation
-    protected byte[] getPasswordHistoryHashFactor(String currentPassword, int userId) {
+    protected byte[] getPasswordHistoryHashFactor(byte[] currentPassword, int userId) {
         return null;
     }
 
     @Implementation
-    protected boolean checkPasswordHistory(String passwordToCheck, byte[] hashFactor, int userId) {
+    protected boolean checkPasswordHistory(byte[] passwordToCheck, byte[] hashFactor, int userId) {
         return false;
     }
 }