Android m preview 2
Merge changes Icdc56a50,I63d5dc28,Ia7d0c5d8,I47406533

* changes:
  Handle RDRAND failures.
  dsa_pub_encode: Write out DSA parameters (p, q, g) in addition to key.
  Fix for CVE-2015-1789.
  Fixes for CVE-2015-1791.