BIND 10 #1792: update b10-auth config handler to support in-memory/sqlite3

[BIND 10 Development]

#1792: update b10-auth config handler to support in-memory/sqlite3
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  b10-auth                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:  xfr    |
  for in-memory                      |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Description changed by jinmei:

Old description:

> This is a subtask of #1787.
>
> We extend auth_config.cc:MemoryDatasourceConfig so that if the
> "filetype" is "sqlite3" (see #1788), it creates a `ZoneIterator` for
> the underlying SQLite3 data source and uses the iterator version of
> InMemoryZoneFinder::load() (see #1791) to load the zone.
>
> Note that this means the config handler needs to instantiate a
> `DataSourceClient` for the corresponding SQLite3 data source.
> Right now I'm not sure how easy/difficult it is.
>
> This task depends on #1788 and #1791.

New description:

 This is a subtask of #1787.

 We extend auth_config.cc:MemoryDatasourceConfig so that if the
 "filetype" is "sqlite3" (see #1788), it creates a `ZoneIterator` for
 the underlying SQLite3 data source and uses the iterator version of
 InMemoryZoneFinder::load() (see #1791) to load the zone.

 Note that this means the config handler needs to instantiate a
 `DataSourceClient` for the corresponding SQLite3 data source.
 Right now I'm not sure how easy/difficult it is.
 See also #1793.  There should be some kind of coordination.

 This task depends on #1788 and #1791.

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Ticket URL: <http://bind10.isc.org/ticket/1792#comment:1>
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