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Starting lease manager in the server constructor implied the use of the
default memfile for a short period until the server is configured. The
default memfile configuration used the persistence (writing leases to disk)
which in many cases required root privileges. This caused some unit tests
to fail.

[mavericks] fix trivial build errors

Conflicts:
	src/lib/util/csv_file.cc
	src/lib/util/csv_file.h

[mavericks] fix trivial build errors

Conflicts:
	src/lib/util/csv_file.cc
	src/lib/util/csv_file.h

 - Unit-tests for DHCPv4 now use configure() method.
 - Typo fixed in DHCPv6 unit-tests.
 - Removed, updated comments in cfgmgr
 - Guide updated

 - Copyright years updated
 - Minor corrections in BINDX Guide
 - dhcp4.spec relay structure description updated.
 - new unit-test for DHCPv4 client classification added
 - new unit-test for DHCPv6 client classification added
 - fixed Doxygen errors
 - comments for CfgMgr::getSubnet{4,6} updated

This change was necessary, because the recent changes to DHCPv4 imply that
subnet is selected for directly connected clients by matching the IPv4
address of the interface on which the message is received, with the
configured subnet.

 - tests/methods descriptions improved
 - CfgMgrTest.echoClientId improved
 - Redundant checks removed from Dhcpv4SrvTest.discoverEchoClientId
 - BIND10 Guide clarified
 - ChangeLog added

 - config parsers updated
 - new unit-tests for vendor options written
 - libdhcp++ cleaned up
 - fixes in option_vendor.cc
 - comments added and cleaned up

 - default value is no longer 0.0.0.0, so global value is no longer
   overwritten with subnet-specific values
 - added 2 new unit-tests to check if the value is really set in
   server responses
 - guide updated to explain that
 - fix in Dhcp4ParserTest.nextServerNegative

 - ASSERT added to unit-tests
 - packetFromCapture() created
 - comments changes

Also, use Ciaddr instead of Yiaddr to get the released lease from the
lease database.