Merge changes I983f361d,I899c8433,Ie6f4b029,Ic3cb9c82,I27107d05

* changes:
  Remove unused variable.
  Remove -i vendor id matching.
  Add quotes to -v INFO/OKAY/FAIL for clarity.
  Remove legacy slot-suffix support.
  Add fastboot_test.cpp and test --os-version/--os-patch-level parsing.