BIND 10 #1600: Use UDPSyncServer for b10-auth

[BIND 10 Development]

#1600: Use UDPSyncServer for b10-auth
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  major         |                    Milestone:  Year
           Component:  b10-auth      |  3 Task Backlog
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  auth
         Total Hours:  0             |  performance
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 After #1599, change b10-auth and server_common so that the auth
 server creates UDPSyncServer object and use it for UDP queries.
 We could also do the same thing for TCP, but it will be a bit trickier
 and TCP query handling is less performance sensitive anyway, so it's
 probably beyond the scope of the short term goals.

 We should also make sure that MessageRenderer is reused.  It's not
 trivial with the mixture of TCP and UDP, and possibly with multiple
 listen on addresses.

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Ticket URL: <http://bind10.isc.org/ticket/1600>
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