Avoid rescheduling HostDBContinuation to the ET_DNS thread. #4907
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With TS-196 (commit a5345da), the HostDBContinuation is no longer
reschedule to the ET_DNS. However, the changes only applied to the
HostDBProcessor::getbyname_imminterface.And the NCA feature was removed by TS-455 (commit 112b03a), so it is
safe to bring the changes to all the interfaces of HostDBProcessor.