GitLab

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.

Change D2UpdateMessage to support TSIG signing and verification via its
toWire and fromWire methods.  Both now accept a pointer to a TSIGContext,
which they should use, if its not NULL.

Implemented DNSCLient::doUpdate variant that accepts a TSIGKey. It will
use the key to create a TSIGContext that will then be used to sign the
outbound request and to verify the response in the operator() method.

Added appropriate unit tests.

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.

Also, some of the comments have been improved in unit tests.