GitLab

 - 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

- add brackets and braces in pools

The makefile already used kea for html.stylesheet so wasn't noticed
before.  This was reported to me off-list.

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.