BIND 10 #2161: remove old datasrc API code

[BIND 10 Development]

#2161: remove old datasrc API code
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    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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 Things like:
 - lib/datasrc/data_source.{h,cc}
 - lib/datasrc/cache.{h,cc}
 - lib/datasrc/sqlite3_datasrc.{h,cc}
 - lib/datasrc/static_datasrc.{h,cc}
 and their tests.

 This is a prerequisite for further cleanups like #254 and #2153.

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Ticket URL: <http://bind10.isc.org/ticket/2161>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development