BIND 10 #2811: Make some DomainTree code updates

[BIND 10 Development]

#2811: Make some DomainTree code updates
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            Reporter:  muks          |                        Owner:  muks
                Type:  enhancement   |                       Status:
            Priority:  medium        |  reviewing
           Component:  data source   |                    Milestone:
            Keywords:                |  Sprint-20130806
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  3             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 Replying to [comment:17 vorner]:
 > I believe it would be more readable to explicitly break out of the loop
 there than rely on the side-effects and influencing the next iteration. Or
 at least putting the explanation into a comment there. But I'll leave it
 up to you.
 >
 > I think it is ready for merge (with or without the change).

 I've added an explicit `break` there along with a comment.

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Ticket URL: <https://bind10.isc.org/ticket/2811#comment:18>
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