BIND 10 #1998: move Formatter classes from DDNS to util

[BIND 10 Development]

#1998: move Formatter classes from DDNS to util
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            Reporter:  jelte         |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           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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 The DDNS work introduces a few Formatter classes used in logging code.
 These seem general enough to move to util.

 They also contain a bit of controversy; their implementation may cause
 slowdown instead of speed-up, but this needs to be looked into.

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Ticket URL: <http://bind10.isc.org/ticket/1998>
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