Added verification mode to PropertyInvalidatedCache

Created a compile-time flag VERIFY that when enabled will compare
any answer returned out of the cache with the true server response.
If the answers differ and the invalidation nonce has not changed,
the cache will log which query induced the response.

Bug: 146018074
Test: Manually flashed and verified that the cache captures invalid
responses.

Change-Id: I716b6aad5c4dac975e96fa05f0e18829f76c8636