am 73ae31ce: add a simple unit test for the OTA package verifier

Merge commit '73ae31ce0ac09c0e45924d817644261c87ab1a60' into eclair-mr2-plus-aosp

* commit '73ae31ce0ac09c0e45924d817644261c87ab1a60':
  add a simple unit test for the OTA package verifier