Dumping the cache is an asynchronous operation, so sleeping for a fixed amount of time after running "rndc dumpdb" is imperfect as dumping cache contents may take longer than expected on slower machines. Instead of always sleeping for 1 second, wait until the "; Dump complete" line appears in the dump or 10 seconds pass, whichever comes first. (cherry picked from commit2bbff06d36) (cherry picked from commite617b91527)