BIND 10 #1506: extract the common patterns from python modules

[BIND 10 Development]

#1506: extract the common patterns from python modules
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            Reporter:  jelte         |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    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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 We have a number of python modules now, and most of those use very similar
 code (for instance for startup, option parsing, catching signals, etc.),
 or their code can be made to be very similar.

 The suggestion is to extract those pieces, and not have duplicate code.

 An addendum is that the dummy module for b10-ddns does a few things a tiny
 bit differently (for instance no global for catching signals, and a
 separate main() function), that we should apply to other modules too. This
 should automatically take care of that (Assuming those things are used in
 this 'extracted' code)

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Ticket URL: <http://bind10.isc.org/ticket/1506>
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