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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.

receiving NameChangeRequests for use with DHCP-DDNS. This includes
abstract listener and sender classes, as well as a derivations
supporting traffic over UDP sockets.

New files added to src/bin/d2

ncr_io.h - base classes
ncr_io.cc

ncr_udp.h - UDP derivations
ncr_udp.cc
tests/ncr_udp_unittests.cc

unit tests. This class embodies a DNS Update request that is sent to DHCP-DDNS
from its clients (typically DHCP servers). The initial wire format is JSON.

The following new files were added:
    src/bin/d2/ncr_msg.h
    src/bin/d2/ncr_msg.cc
    src/bin/d2/tests/ncr_unittests.cc

collection of classes for housing and parsing the application configuration
necessary for the DHCP-DDNS application. This rounds out the D2CfgMgr initial
implementation.

New files:
   src/bin/d2/d2_config.cc
   src/bin/d2/d2_config.h
   src/bin/d2/tests/d2_cfg_mgr_unittests.cc

D2. It introduces DCfgMgrBase, abstract class for processing updates
to configuration, DCfgContext for storing configuration; and D2
specific initial derivations of each, D2CfgMgr and D2CfgContext.
These are skeletal derivations that will be expanded to handle
DHCP-DDNS specific configuration. New files added:

  src/bin/d2/d_cfg_mgr.h
  src/bin/d2/d_cfg_mgr.cc
  src/bin/d2/d2_cfg_mgr.h
  src/bin/d2/d2_cfg_mgr.cc
  src/bin/d2/tests/d_cfg_mgr_unittests.cc

now b10-dhcp-ddns.

will be required to make d2 build.
Modified files:
    Makefile.am
    d2_log.cc
    d2_log.h
    d2_messages.mes
    d2.spec
    main.cc
    tests/Makefile.am
    tests/d2_test.py
New files:
    d2_controller.cc
    d2_controller.h
    d_controller.cc
    d_controller.h
    spec_config.h
    tests/d2_controller_unittests.cc
    tests/d_controller_unittests.cc
    tests/d_test_stubs.cc
    tests/d_test_stubs.h

to DProcessBase.

and source. Corrected other review items.

and make files; and process framework for the DHCP-DDNS daemon,
b10-d2srv.