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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.

Adds the initial implementation of b10-dhcp-ddns NameChangeTransaction class.
This class is an abstract, state-model driven class which provides the basic
mechanics for performing DDNS updates based on a NameChangeRequest.

This initializes the basic data structures of the memory manager and
starts loading data into the segments.

Conflicts:
	ChangeLog
	src/lib/dhcpsrv/memfile_lease_mgr.cc
	src/lib/dhcpsrv/memfile_lease_mgr.h
	src/lib/dhcpsrv/tests/mysql_lease_mgr_unittest.cc

... and don't generate isc/server_common/bind10_server.py from
isc/server_common/bind10_server.py.in. This fixes a builddir vs srcdir
path failure for the isc.server_common module.

- Patch by David Carlier

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

By mistake, the previous merge was missing the changes which addressed
review comments.

Don't LDADD the xfr library for the resolver.
This was probably just a copy and paste mistake.
I brought this up on jabber a few days ago.

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.

Master moved ahead while I was merging in 3075. This is
the remerge.

Added main process event loop to src/bin/d2/D2Process,
which is the primary application object in b10-dchp-ddns.

Also, cleaned up whitespaces.

Replaced use of EXPECT_EQ(false,) with EXPECT_FALSE()
in d2_process_unittests.cc.  These were failing to
compile under Fedora 18/gtest 1.6. This appears to be
a gtest bug.  Other minor changes.

Remove condition that spec_file_name is omitted (None is specified). Revise
documentation of Counters and add a unit test to assert an exception raised when
specifying an invalid argument.