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D2 now uses bison parsing to parse its config file and has starter
files for SimpleParser. This check-in uses only generic JSON context
parsing (i.e. no D2 specific grammar).

Added new bison/flex parsing files:
    d2_lexer.ll
    d2_parser.yy
    parser_context.cc
    parser_context.h
    parser_context_decl.h

Added new generated files:
    d2_parser.cc
    d2_parser.h
    location.hh
    position.hh
    stack.hh

Added new SimpleParser related files:
    d2_simple_parser.cc
    d2_simple_parser.h

src/bin/d2/Makefile.am
    Added bison/flex related entries and rules

src/bin/d2/d2_controller.h
src/bin/d2/d2_controller.cc
    D2Controller::parseFile() - new method which overrides base class
    version and calls new bison parsing to parse JSON config file.

By generating config_report.cc in the cfgrpt directory Makefile
rather than configure, it can be treated as any other generated
source file, rather than a one-off special case.

Moved cfgrpt directory from bin to lib since it creates a library
rather than an executable.

mk_cfgrpt.sh is now generated by configure from a .in file and

Details:

configure.ac
   removed call to mk_cfgrpts.sh
   added mk_cfgprt.sh to list of files generated by configure

src/bin/Makefile.am
   removed cfgrpt dir

changed cfgrpt directory to lib
    src/bin/d2/Makefile.am
    src/bin/d2/tests/Makefile.am
    src/bin/dhcp4/Makefile.am
    src/bin/dhcp4/tests/Makefile.am
    src/bin/dhcp6/Makefile.am
    src/bin/dhcp6/tests/Makefile.am
    src/bin/lfc/Makefile.am
    src/bin/lfc/tests/Makefile.am
    src/bin/perfdhcp/Makefile.am
    src/bin/perfdhcp/tests/Makefile.am

src/lib/Makefile.am
    added cfgrpt dir

src/lib/cfgrpt/Makefile.am
    changed include dir to be in lib not dir
    added config_report.cc to CLEANFILES
    added config_report.cc to BUILD_SOURCES
    removed config_report.cc from libcfgrpt_la_SOURCES
    added rule for config_report.cc to call mk_cfgrpt.sh

Created d2::IOSignal and d2::IOSignalQueue for propagating
caught OS signals to IOService instances.
Added TimedSignal test class.

New files:
    src/bin/d2/io_service_signal.cc
    src/bin/d2/io_service_signal.h
    src/bin/d2/tests/io_service_signal_unittests.cc

The configuration switch --with-kea-config, now selects between
two versions of D2Controller:

1. One which must run as a BUNDY module and is implemented in
bundy_d2_controller.(h/cc)

All of the BIND10 support was extracted from DControllerBase and moved
into this version of D2Controller.

This controller is tested in tests/bundy_d2_controller_unittests.cc

2. One that runs as a stand alone executable which must be supplied
with a configuration file via the command line and is implemented in
d2_controller.(h/cc).

This version of D2Controller is nearly identical the the original.
DControllerBase supports configuration from file.

This controller is tested in tests/d2_controller_unittests.cc

DControllerBase now inherits from Daemon which keeps it in step with
K4 and K6.

The stand-alone mode flag has been removed from all controllers.

Interrim check-in for 3088, which introduces the initial
implementation of d2:NameRemoveTransaction.  This class
implements the state model logic necessary for removing
DNS entries per RFC 4703.  The state model logic is
complete, what remains is the logic to build the actual
request messages.

Observed compilation issues on Debian 7 when libdhcp++ was not explicitly
linked to the DDNS module.

This interrim checkin includes the initial implementation of
NameAddTransaction to b10-dhcp-ddns.  It provides the preliminary
state model needed to add forward and/or reverse DNS entries for
and FQDN.  It does not yet construct the actual DNS update requests.

Some classes were using references to isc::asiolink::IOService, others
where using d2::IOServicePtr.  The latter is now used throughout for
consistency as well as support for future, possible, multi-threaded
implementation.

Created new classes, LabeledValue and LabeledValueSet to
provide a cleaner mechanism for defining the set of valid events
and states.  With this commit, events now use these new constructs.
The modifications to use these constructs for states will be done
as separate commit.

Some addtional, minor review comments were also addressed.

b10-dhcp-ddns Finite state machine logic was refactored into its own class,
StateModel.

Interim commit for 3086 which includes the preliminary implementation
of the base class, NameChangeTransaction.  b10-dhcp-ddns module will use
derivations of this class to carry out NameChangeRequests.

Added initial implemenation of D2UpdateMgr class to src/bin/d2.

D2QueueMgr class queues NameChangeRequest messages
received from DHCP_DDNS clients.

NameChangeRequests from src/bin/d2 into their own library,
libdhcp_ddns, in src/lib/dhcp_ddns.