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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.

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.

Minor corrections only, there were no major revisions.

 - hooks documentation updated
 - dhcp4 message logs updated
 - long lines wrapped in dhcp4_srv.cc
 - unit-test names now use camel notation
 - Pkt4::bufferOut_ renamed to buffer_out_

The new hooks tests require two shared libraries, which were not generated
when static linking was used and caused tests to fail. This patch forces
generation of these shared libraries. Okayed on jabber.

Also, updateLease4 and updateLease6 are implemented.

This commit also changes the ParserContext copy constructor and assignment
operator to handle copying of the NULL shared pointers.

It was used in tests only. We may abuse the shutdown command for that.

Added main process event loop to D2Process which is the
primary application "object" in b10-dchp-ddns.

Along the way it was necessary to adjust D2QueueManager to treat
stopping as an asyncrhonous event when IO is pending. This
requied a change in lib-dchp-ddns to have awareness of when
IO is pending.

Fixed a bug in D2 configuration parsing in which parsing a
a subsequent configuration caused duplicate TSIGKeyInfo
entries.