am bce05d91: am 45e56fd5: cherypick from mr2: Ib7e08e719b6b9c9b1e8116e6e2a77611f046b276 Switch APK signing from MD5WithRSA to SHA1WithRSA.

* commit 'bce05d9125d7c9bf536bc6cb1758c7cd3e485166':
  cherypick from mr2: Ib7e08e719b6b9c9b1e8116e6e2a77611f046b276 Switch APK signing from MD5WithRSA to SHA1WithRSA.