src/lib/dhcpsrv/client_class_def.cc
    - updated comment on empty expressions in ctor,
    - cleaned up whitespace

src/lib/dhcpsrv/parsers/client_class_def_parser.cc
    - ExpressionParser::build() - integrated use of Eval
    parsing in ExpressionParser
    - cleaned up whitespace

src/lib/dhcpsrv/tests/client_class_def_parser_unittest.cc
    Updated tests to verify that expressions are actually
    parsed and function.

Merge branch 'trac4096' of ssh://git.kea.isc.org/git/kea into trac4096

    Eval library now supports actual parsing.  Need to use it
    in class definition's ExpressionParser.

src/bin/dhcp4/tests/config_parser_unittest.cc
src/bin/dhcp6/tests/config_parser_unittest.cc
src/lib/dhcpsrv/client_class_def.h
    Fixed spellings and spacing.

src/lib/dhcpsrv/Makefile.am
src/lib/dhcpsrv/tests/Makefile.am
    Move eval lib up in the link order

    Merged in branch 'trac4117'

    Now that libdhcpsrv depends on libeval, eval must be built first.

    src/bin/dhcp6/json_config_parser.cc
        - createGlobalDhcp6ConfigParser() - creates ClientClassDefListParser
        for "client-classes" element
        - configureDhcp6Server() - runs the ClientClassDefListParser against
        the "client-classes" element

    src/bin/dhcp6/tests/config_parser_unittest.cc
        Added new tests for parsing client class definitions:
        TEST_F(Dhcp6ParserTest, clientClassDictionary)
        TEST_F(Dhcp6ParserTest, invalidClientClassDictionary)

    src/bin/dhcp6/dhcp6.spec
        Added global "client-classes" element

src/bin/dhcp4/json_config_parser.cc
    - createGlobalDhcp4ConfigParser() - creates ClientClassDefListParser
    for "client-classes" element
    - configureDhcp4Server() - runs the ClientClassDefListParser against
    the "client-classes" element

src/bin/dhcp4/tests/config_parser_unittest.cc
    Added new tests for parsing client class definitions:
    TEST_F(Dhcp4ParserTest, clientClassDictionary)
    TEST_F(Dhcp4ParserTest, invalidClientClassDictionary)

src/bin/dhcp4/dhcp4.spec
    Added global "client-classes" element

src/lib/dhcpsrv/parsers/client_class_def_parser.cc
    ClientClassDefListParser::commit() - pushes the newly built local
    dictionary to CfgMgr staging

src/lib/dhcpsrv/srv_config.h
src/lib/dhcpsrv/srv_config.cc
    Added client class dictionary member to SrvConfig

src/lib/dhcpsrv/tests/client_class_def_parser_unittest.cc
    TEST_F(ClientClassDefListParserTest, simpleValidList) - now
    verifies that ClientClassDefListParser::commit() pushes its
    local dictionary to CfgMgr staging.

src/lib/dhcpsrv/tests/srv_config_unittest.cc
    Added support to test new client class dictionary member

In anticipation adding client class storage to SrvConfig:

src/lib/dhcpsrv/client_class_def.h
src/lib/dhcpsrv/client_class_def.cc
    added copy contructor, equals() method, ==, != operators
    To ClientClassDef and ClientClassDictionary

src/lib/dhcpsrv/tests/client_class_def_unittest.cc
    Added copyAndEquality tests for ClientClassDef and
    ClientClassDictionary

New Files:
    parsers/client_class_def_parser.cc
    parsers/client_class_def_parser.h
    tests/client_class_def_parser_unittest.cc

src/lib/dhcpsrv/parsers/Makefile.am
    Added entries for new files
    Added EXTRA_DIST entries for several files that were missing.

src/lib/dhcpsrv/parsers/dhcp_parsers.h
    Added typedef for OptionDataListParserPtr

src/lib/dhcpsrv/tests/Makefile.am
    Added entries for new unitest file

src/lib/dhcpsrv/tests/client_class_def_unittest.cc
    Fixed broken unit test TEST(ClientClassDef, cfgOptionBasics)