BIND 10 #2993: extend ConfigurableClientList::getCachedZoneWriter() to have catch_load_error

[BIND 10 Development]

#2993: extend ConfigurableClientList::getCachedZoneWriter() to have
catch_load_error
-------------------------------------+-------------------------------------
                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Th memmgr will have to do the same thing as #2905 for initial loading.
 To make it possible, we need to extend `getCachedZoneWriter()`
 have another `catch_load_error` parameter, which will be passed to
 the `ZoneWriter` constructor:

 {{{#!cpp
     ZoneWriterPair getCachedZoneWriter(const dns::Name& zone,
                                        bool catch_load_error,
                                        const std::string& datasrc_name =
 "");
 }}}

 We'll also need to update the Python wrapper (this part depends on #2853).

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Ticket URL: <http://bind10.isc.org/ticket/2993>
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BIND 10 Development