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1. catch the exception when xfrin sending the zone transfer result to others modules, msgq may has been killed at that time. 2. change the delay time of boss process between sending command 'shutdown' and signal 'SIGTERM'.

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac335@3078 e5f2f494-b856-4b98-b285-d166d9295462