BIND 10 #1074: Use debug levels consistently

[BIND 10 Development]

#1074: Use debug levels consistently
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                   Reporter:         |                 Owner:  UnAssigned
  stephen                            |                Status:  reviewing
                       Type:         |             Milestone:
  enhancement                        |  Sprint-20111025
                   Priority:  minor  |            Resolution:
                  Component:         |             Sensitive:  0
  logging                            |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  6.0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by stephen):

 * owner:  stephen => UnAssigned
 * status:  assigned => reviewing


Comment:

 As only a few common debug levels have been set and future modules may
 need to defined their own debug levels, the following approach has been
 taken:  the symbols used in different modules have been left alone alone,
 but they are now defined in terms of the common levels.

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Ticket URL: <http://bind10.isc.org/ticket/1074#comment:8>
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