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Also, added documentation to the Host class.

 - clarified that returned offset refers to last successfully parsed option
 - unpackOptions6() now returns proper offset if vendor-option is truncated

 - duplicate warning removed.
 - unpackVendorOptions4 now returns proper offset when option is truncated

 - (offset - 4) explained better
 - Modified Dhcpv6Srv::unpackOptions()
 - setHWAddrMember() mac_addr renamed (this time for real)
 - Commented out unused variables
 - RelayInfo now uses DEFAULT_ADDRESS6 in ctor
 - LibDHCP::unpackOptions6 and callback now used uniformly
 - Clarified that ERO is Echo Request Option (RFC4994)
 - unpackOptions4 in libdhcp and Dhcp4Srv no longer throw when
   truncated option is received.

 - Pkt4, Pkt6 classes now have descriptions
 - Many descriptions updated in Pkt class
 - Pkt::addOption() moved back to Pkt (from Pkt6)
 - DEFAULT_ADDRESS{,6} are now in private namespace.
 - copyright updated

Perfdhcp can be used with option -l to specify the local address to be
used.

However, when this option is used on a secondary address of an
interface, this doesn't work correctly.

The packets are sent with:
- giaddr = adresse specified (correct)
- source ip address = the interface primary IP address

Here is a patch that correctly sets the source IP address before sending
the packet.
This allows to launch multiple perfdhcp processes at the same time,
sharing the same interface but each using a distinct IP address.

 - ChangeLog updated
 - applyDefaultConfiguration() removed
 - couple unit-tests renamed
 - comments added for code that uses TEST_DATA_TOPBUILDDIR
 - copyright years updated
 - one function moved: logger_unittest_support.cc => logger_support.cc

 - Logging section updated.
 - Missing coma in kea.conf.pre added
 - ${localstatedir}/log is now created

The modifications to the staging configuration are performed on the pointer
returned by getCfgOptionDef.