dhcp-relay: integrate into dhcp chapter

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diff --git a/docs/services/dhcp-relay.rst b/docs/services/dhcp-relay.rst
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-
-
-DHCP Relay
-----------
-
-If you want your router to forward DHCP requests to an external DHCP server
-you can configure the system to act as a DHCP relay agent. The DHCP relay
-agent works with IPv4 and IPv6 addresses.
-
-All interfaces used for the DHCP relay must be configured. See
-https://wiki.vyos.net/wiki/Network_address_setup.
-
-DHCP relay example
-^^^^^^^^^^^^^^^^^^
-
-.. figure:: /_static/images/service_dhcp-relay01.png
-   :scale: 80 %
-   :alt: DHCP relay example
-
-   DHCP relay example
-
-In this example the interfaces used for the DHCP relay are eth1 and eth2. The
-router receives DHCP client requests on eth1 and relays them through eth2 to
-the DHCP server at 10.0.1.4.
-
-Configuration
-^^^^^^^^^^^^^
-
-Enable DHCP relay for eth1 and eth2:
-
-.. code-block:: sh
-
-  set service dhcp-relay interface eth1
-  set service dhcp-relay interface eth2
-
-Set the IP address of the DHCP server:
-
-.. code-block:: sh
-
-  set service dhcp-relay server 10.0.1.4
-
-The router should discard DHCP packages already containing relay agent
-information to ensure that only requests from DHCP clients are forwarded:
-
-.. code-block:: sh
-
-  set service dhcp-relay relay-options relay-agents-packets discard
-
-Commit the changes and show the results:
-
-.. code-block:: sh
-
-  commit
-  show service dhcp-relay
-      interface eth1
-      interface eth2
-      server 10.0.1.4
-      relay-options {
-         relay-agents-packets discard
-      }
-
-The DHCP relay agent can be restarted with:
-
-.. code-block:: sh
-
-  restart dhcp relay-agent
-
-DHCPv6 relay example
-^^^^^^^^^^^^^^^^^^^^
-
-.. figure:: /_static/images/service_dhcpv6-relay01.png
-   :scale: 80 %
-   :alt: DHCPv6 relay example
-
-   DHCPv6 relay example
-
-In this example DHCPv6 requests are received by the router on eth1
-(`listening interface`) and forwarded through eth2 (`upstream interface`) to
-the external DHCPv6 server at 2001:db8:100::4.
-
-Configuration
-*************
-
-Set eth1 to be the listening interface for the DHCPv6 relay:
-
-.. code-block:: sh
-
-  set service dhcpv6-relay listen-interface eth1
-
-Set eth2 to be the upstream interface and specify the IPv6 address of
-the DHCPv6 server:
-
-.. code-block:: sh
-
-  set service dhcpv6-relay upstream-interface eth2 address 2001:db8:100::4
-
-Commit the changes and show results:
-
-.. code-block:: sh
-
-  commit
-  show service dhcpv6-relay
-      listen-interface eth1 {
-      }
-      upstream-interface eth2 {
-         address 2001:db8:100::4
-      }
-
-Show the current status of the DHCPv6 relay agent:
-
-.. code-block:: sh
-
-  show dhcpv6 relay-agent status
-
-The DHCPv6 relay agent can be restarted with:
-
-.. code-block:: sh
-
-  restart dhcpv6 relay-agent
-
-Additional parameters
-^^^^^^^^^^^^^^^^^^^^^
-
-DHCP relay agent options
-************************
-
-Set the maximum hop count before packets are discarded. Range 0...255,
-default 10.
-
-* :code:`set service dhcp-relay relay-options hop-count 'count'`
-
-Set maximum size of DHCP packets including relay agent information. If a
-DHCP packet size surpasses this value it will be forwarded without appending
-relay agent information. Range 64...1400, default 576.
-
-* :code:`set service dhcp-relay relay-options max-size 'size'`
-
-Four policies for reforwarding DHCP packets exist:
-
-* **append:** The relay agent is allowed to append its own relay information
-  to a received DHCP packet, disregarding relay information already present in
-  the packet.
-
-* **discard:** Received packets which already contain relay information will
-  be discarded.
-
-* **forward:** All packets are forwarded, relay information already present
-  will be ignored.
-
-* **replace:** Relay information already present in a packet is stripped and
-  replaced with the router's own relay information set.
-
-* :code:`set service dhcp-relay relay-options relay-agents-packet 'policy'`
-
-DHCPv6 relay agent options
-**************************
-
-Set maximum hop count before packets are discarded. Default: 10.
-
-* :code:`set service dhcpv6-relay max-hop-count 'count'`
-
-If this is set the relay agent will insert the interface ID. This option is
-set automatically if more than one listening interfaces are in use.
-
-* :code:`set service dhcpv6-relay use-interface-id-option`