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Addendum to ticket 2524 - the makefile omitted to make sure the
dhcpsrv_messages.mes file were in the distribution tarball

New feature was added: deleteSubnets4

okayed via jabber.

Also make the hardware address to string function common to both
database modules.

Having duid.{h, cc} in libdhcp++ causes dependency between two libraries.
Due to this dependency multi-threaded build fails because libs are created
by different threads simultaneously and race condition occurs. Libraries
should be moved to separate folders and have separate makefiles. This
complies with BIND10 structure and will make this issue goe away.

Also add missing library into the makefile - this showed its
absence on OS/X.

Also includes first unit test, which fails.

Changed existing interface; see commit
219324e6 about the refactoring.

The error seen was:

[ RUN      ] PerfPkt4Test.RawUnpack
/libexec/ld-elf.so.1: /usr/home/jreed/builder/work/BIND10-cppcheck/20120620073005-FreeBSD8-amd64-GCC/build/tests/tools/perfdhcp/tests/.libs/run_unittests: Undefined symbol "_ZN3isc4dhcp6Option7setDataEN9__gnu_cxx17__normal_iteratorIPKhSt6vectorIhSaIhEEEES9_"