GitLab

Added discussion of reverse DNS udpates to tables 17.4 and 18.4.
Fixed other minor typos.

Server port default in the dhcp-ddns.spec was incorrect.

Added the first draft of DHCP-DDNS Chapter. Need to fill in the
example configuration section.

    Added secctions for configuring dhcp-ddns to DHCPv4 and DHCPv6 sections.
    Added empty Chapter for DHCP-DDNS server.

Conflicts:
	ChangeLog
	src/bin/dhcp6/tests/dhcp6_srv_unittest.cc

Corrects DHO_HOST_OPTION bug in b10-dhcp4.

b10-dhcp6 parses and uses ddns-dhcp configuration

Reviewed required a few comments to be added.

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

Modified Dhcpv4Srv to handle DHO_HOST_NAME as an OptionString
rather than an OptionCustom.