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Split the logging into three loggers
 config & general
 dhcp to d2
 d2 to dns (and back)

Print out a request ID for each NCR event.  Currently this is the
DHCID but it could be changed in the future to allow for comparing
log entries between DHCP servers and D2.

Fix up some typos I ran across while reading the code

Consolidated DNSClient::doUpdate variants into a single method which
accepts a smart pointer to a TSIGKey instead of TSIGKey reference.
Simplified some unit tests.
Added missing commentary.
Corrected typos and copyright dates.

Added missing commentary, corrected typos.

NameChangeTransaction now sets its TSIGKeyPtr inside initServeSelection()
from the domain pased into this method.

This makes TSIG fully fucntionally end-to-end.

Added TSIGKeyPtr instance member to NameChangeTransaction.
Modified NameChangeTransaction::sendUpdate() to do a TSIG updates if its
TSIGKeyPtr is not null.

Extended FauxServer test class to support TSIG if given a key.
Added round trip TSIG tests to NameChangeTransaction base class tests.

This does not address how the transaction's key is determined. That
requires changes to configuration classes in D2Config.

Update manager now passes the D2 config manager reference into transactions
when it creates them. This makes D2 configuration services available at
the transaction level.

Changed NameChangeTransaction::sendUpdate() to get the timeout value from
configuration rather than use hard-coded constant.

In addition to minor corrections, unit tests for NameChangeTransaction::
responseString was added.  Also added a similiar method NameChangeTransaction::
transactionOutcomeString() and unit tests.

Added descriptive message comment log statement for
to outbound DNS update requests, and conversion of status
and RCODEs for DNS inbound responses to b10-dhcp-ddns log.

Added commentary to d2/tests/nc_test_utils.h::FauxServer
Corrected doxygen errors

Changed DNSClient ctor to require response param be
an empty pointer and clarified related commentary.
Added debug log statement to log transaction start.
Other minor cosmetics.

Now that NameAddTransaction and NameRemoveTransction classes
have been implemented, D2UpdateMgr has been updated to use
them.  It now creates instances of NameAddTransaction and
NameRemoveTransaction based on the change type specified in
received NameChangeRequests as designed.

Changes are largely clean up and commentary.

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.

Changed dhcp_ddns::NameChangeRequest to store lease address as
IOAddress only.  Corrected logic that handles request build
exceptions and added unit tests for same.  Other minor changes.

Added methods for constructing all three types of DNS update requests
required by d2::NameAddTransaction to complete the implementation of its
state machine.  Also refactored some unit test code into nc_test_utils.h
and .cc, and ran much needed spell checking.

Minor corrections based on re-review.

Good deal of commentary clean up, rolled back IOService reference
changes to DNSClient, and most significantly added unit tests
for NameChangeTransaction::sendUpdate.  These tests involve an
actual message exchange.

Created unit tests for all of the states implemented by NameAddTransaction
in b10-dhcp-ddns.  The class lacks only proper construction of DNS update
requests.

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.

Added empty implemenation of StateMode::onModelFailure and
renamed event and state boundary constants.

This commit replaces the state specification mechanism in d2::StateModel
with one derived from LabeledValue and LabeledValueSet.

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.

Added virtual method for validating state handler map, added additional unit tests and commentary.

Added methods to base class for supporting server selection from a list
of DNS servers.

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.