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- DHCPv6 server now sends DNS-SERVERS option
- refactored processSolicit(), processRequest()
- added appendDefaultOptions(), appendRequestedOptions(), assignLeases()
- many parameters are now const &
- const HARDCODDED_* parameters added for similar customizations
- IfaceMgr::openSockets6() now skips loopback, down, or unicast interfaces.

- Vector initialization clean-ups
- Typo in comment

- appendRequestedOptions(), assignLease() added in dhcpv4_srv class.
- dhcpv4_srv now uses hardcoded values from 192.0.2.0/24 range.

- added tests for processDiscover(), processOffer() in dhcpv4_srv
- added test for setUintX in OptionTest
- updates Pkt4Test (now unpack checks if mandatory Message Type option is present)

- processDiscover(), processRequest(), copyDefaultFields(),
  appendDefaultOptions() implemented in dhcpv4_srv class

- setUint8(), setUint16(), setUint32() added to Option class.

- Pkt4 class now properly sets packet type after parsing.

Conflicts:
	ChangeLog
	src/bin/dhcp4/dhcp4_srv.cc
	src/bin/dhcp6/dhcp6_srv.cc
	src/lib/dhcp/iface_mgr.cc
	src/lib/dhcp/iface_mgr.h

Conflicts:
	ChangeLog
	src/bin/dhcp6/dhcp6_srv.cc
	src/lib/dhcp/Makefile.am
	src/lib/dhcp/iface_mgr.cc
	src/lib/dhcp/iface_mgr.h
	src/lib/dhcp/tests/Makefile.am

Conflicts:
	ChangeLog
	src/bin/dhcp4/tests/Makefile.am
	src/bin/dhcp6/tests/Makefile.am
	src/bin/dhcp6/tests/dhcp6_srv_unittest.cc
	src/lib/dhcp/libdhcp++.cc
	src/lib/dhcp/tests/pkt4_unittest.cc

Conflicts:
	src/bin/Makefile.am

Conflicts:
	ChangeLog

	useful in DNSSEC situation when the resolver fully supports
	DNSSEC-aware clients.

with a few amendments, see ticket comment

	argument

- unlink() moved to destructor as suggested by Jinmei
- added missing dummy interfaces.txt

- Fixed distcheck complaining about file left in src/bin/dhcp4
- Fixed socket binding problem in src/lib/dhcp/tests/iface_mgr
- Fixed OSError problem in src/bin/dhcp6/tests/dhcp6_test.py on NetBSD

A previous change updated the test for removeIdentical().  This
change was omitted from the test for the const version.

Unrelated cleanup.

trivial, okayed on jabber.