Augment business logic caching

1) add option --clean-cache-business-logic to refresh cache, saving
    users from manual deletion of cached files under /tmp
2) use hashcode of total request string (instead of base url) to
    avoid using cache generated with different test device
3) add timestamp details to host log

bug: 62867056
Test: manual
Change-Id: I36e318263f427f4b12605266935bc484679c5f3c
1 file changed