BIND 10 #1165: allow specifying xfrout ACL per zone basis

[BIND 10 Development]

#1165: allow specifying xfrout ACL per zone basis
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  xfrout        |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Currently xfrout can only have process-wide ACL, but the common practice
 is to configure different zones with different access control policies
 (such as by using different TSIG keys).

 Ideally we should solve this in a generic way (like introducing
 generic zone configuration and having xfrout refer to it), but it
 would be a big task while the usage gap for xfrout would be more
 urgent.  So the proposal is to solve this in a possibly ad hoc, xfrout
 specific way as a middle term workaround.

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Ticket URL: <http://bind10.isc.org/ticket/1165>
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BIND 10 Development