am 8cd5592c: am bce05d91: am 45e56fd5: cherypick from mr2: Ib7e08e719b6b9c9b1e8116e6e2a77611f046b276 Switch APK signing from MD5WithRSA to SHA1WithRSA.

* commit '8cd5592c5fc2d13e7ab60b2cd25dd9cc90e1e124':
  cherypick from mr2: Ib7e08e719b6b9c9b1e8116e6e2a77611f046b276 Switch APK signing from MD5WithRSA to SHA1WithRSA.