new files:
    src/bin/d2/tests/
        d2_simple_parser_unittest.cc
        parser_unittest.cc
        parser_unittest.h

src/bin/d2/d2_cfg_mgr.h
src/bin/d2/d2_cfg_mgr.cc
    D2CfgMgr::parseElement() - overrides base class implementation,
    flag global parameters as parsed without pushing them to D2CfgContext
    value stores

    D2CfgMgr::setCfgDefaults() - overrides base class implementation,
    sets defaults for D2

    D2CfgMgr::buildParams() - revamped to pull parameters from the given
    element map instead of context value stores.  Removed checks that
    are now done by JSON parser.

src/bin/d2/d2_controller.cc
    D2Controller::parseFile() - instead of generic JSON parsing, parse
    file with PARSER_DHCPDDNS context

src/bin/d2/d2_lexer.ll
src/bin/d2/d2_parser.yy
    Changed namespace from dhcp to d2
    Added PARSER_SUB_DHCPDDNS and D2 global parameter parsing
    Added objects for forward-ddns, reverse-ddns, tsig-keys

src/bin/d2/parser_context.cc
src/bin/d2/parser_context.h
    Added PARSER_DHCPDDNS, PARSER_SUB_DHCPDDNS

src/bin/d2/tests/Makefile.am
    Added new test source files

src/bin/d2/tests/d2_cfg_mgr_unittests.cc
src/bin/d2/tests/testdata/d2_cfg_tests.json
    TEST_F(D2CfgMgrTest, configPermutations) - revamped to test JSON parsing
    as well as element parsing

src/bin/d2/tests/parser_unittest.h
src/bin/d2/tests/parser_unittest.cc
    New file that tests basic JSON parsing

src/lib/cc/data.h
    Added parens around TypeError position error text

src/lib/cc/simple_parser.cc
    SimpleParser::setDefaults() - added logic to detect bad lexical casts
    when handling integers