Ensure force_cache attribute ignores Date header (#5298)

When force_cache is true, do not use the Date header set
by the server as the value to use for TTL initialization,
but rather create it from the current instant.

* Rename all current interQuery* tests to intraQuery*
* Add e2e test cases for forced http.send interQueryCaching

Fixes #4960

Signed-off-by: Anders Eknert <anders@eknert.com>