This keeps the behavior the same but allows the heartbeat to be used as a crude timer
without including everything the housekeeper.h header includes.
Moved the protocol level updates on the DCBs last_read value into dcb_read.
This keeps the implementation nice and compact.
Added a header which contains the locations for the testing directory and its subfolders which enables
the test to write into the right logfiles. Also added a calls to skygw_log_sync_all before assertions
forcing all logs to be written to disk at the time the test might fail.
