BIND 10 #1611: ZoneFinder::find refactoring: separate normal result codes and special case flags

[BIND 10 Development]

#1611: ZoneFinder::find refactoring: separate normal result codes and special case
flags
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           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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 See #1431, especially http://bind10.isc.org/ticket/1431#comment:17

 This is a follow up task of that topic:
 - remove WILDCARD_xxx from the result codes
 - update the data base finder implementation accordingly: have it use
   the flags for wildcard and NSEC (and eventually NSEC3) cases
 - update database test accordingly
 - update python wrapper and its applications and tests accordingly
 - update documentation

 This is basically a straightforward refactoring (actually I've mostly
 done as of this writing), but many parts of the code will have to be
 modified.

 This task is not absolutely necessary for completing NSEC3 in in
 memory, but I hope we can complete it sooner than later (if not in
 this coming sprint, in the next one).

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Ticket URL: <http://bind10.isc.org/ticket/1611>
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