BIND 10 #1379: move zone/address formatters for logging to some util lib

[BIND 10 Development]

#1379: move zone/address formatters for logging to some util lib
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            Reporter:  jelte         |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  minor         |                    Milestone:  Next-
           Component:  Unclassified  |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  Core          |              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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 When done, #1298 introduced two functions to format zone/class and
 ipaddress/port information for easier use when logging or printing them.
 These functions should be moved to a separate library (and for the address
 one, we should consider what argument type(s) it should get), like
 src/lib/python/isc/util/format.py or something.

 When done, the logging calls in other modules should be checked and
 modified to use these functions so we have a consistency in our logging
 output.

 We may need to add these in c++ as well.

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Ticket URL: <https://bind10.isc.org/ticket/1379>
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