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)