Add more tests for verify_package_compatibility().

This now covers the actual calls to libvintf, and asserts we're getting
identical results through verify_package_compatibility() and by calling
libvintf directly.

We were missing the coverage and introduced the double free bug (fixed
by commit f9782789).

Bug: 37413730
Test: recovery_component_test passes.
Test: recovery_component_test fails w/o commit
      f9782789.
Change-Id: If5195ea1c583fd7c440a1de289da82145e80e23c