Merge "Use LockPatternUtils.resetKeyStore() to clear keystore" into nyc-dev
am: fec38d0699

* commit 'fec38d06991b0c49750d02e27e6d8a452a1bca29':
  Use LockPatternUtils.resetKeyStore() to clear keystore

Change-Id: I1231288f2e7c5166885992b103e720f467358858