[3075] Address review comments.

Minor corrections only, there were no major revisions.
[3075] A few trivial fixes in dhcp-ddns.
[3075] Additional review changes.

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.