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New feature was added: deleteSubnets4

okayed via jabber.

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_"

Adding such comments was discussed and agreed on jabber with Jinmei.

Some versions of GCC warn about some versions of Boost regarding
missing initializer for members in its posix_time.
https://svn.boost.org/trac/boost/ticket/3477
But older GCC compilers don't have the flag.

This is the same as on a few other Makefiles too.

The -no-undefined I added previously caused failures on Mac.
On my Linux and NetBSD tests it didn't notice. But the Macmini
detected it.  The top of error output is clear:

Undefined symbols:
  "isc::asiolink::IOAddress::operator unsigned int() const", referenced
from:
      isc::dhcp::IfaceMgr::send(boost::shared_ptr<isc::dhcp::Pkt4>
const&)in libdhcp___la-iface_mgr.o

Okayed by tomek via jabber.

The libdhcp++ API was changed as part of the refactoring.

When linking new tests to old library it fails with:

/libexec/ld-elf.so.1:
/usr/home/jreed/builder/work/BIND10-cppcheck/20120516153001-FreeBSD8-amd64-GCC/build/src/bin/dhcp4/tests/.libs/dhcp4_unittests:
Undefined symbol "_ZN3isc4dhcp6OptionC1ENS1_8UniverseEtRKSt6vectorIhSaIhEE"

This is:
 isc::dhcp::Option::Option(isc::dhcp::Option::Universe, unsigned short,
std::vector<unsigned char, std::allocator<unsigned char> > const&)

See http://bind10.isc.org/wiki/LibraryVersioning for details.

and renamed libdhcp_unittest to libdhcp++_unittest

(but didn't change LibDHCP within code)

- Interface detection implemented for Linux.
- OS-specific defines added to configure.ac
- Added stub interface detection for BSD systems.

- IfaceMgr moved
- Added new, simple test for b10-dhcp4 daemon
- Added skeleton man page for b10-dhcp4