dhcp: multiple additions

DHCP additions:
1) DHCPv4 will only relay a message back to the client, if the Option82 information is present. So make this the default.
2) It is no longer possible to select via the API to "insert circuit ID" - since this is now default
3) Remove the version 2 API since it's now the same as version 1.
4) Adding the VSS option is now conditional only on the presence of VSS config (not the 'insert' option in the set API)
5) DHCP proxy dump via API

Change-Id: Ia7271ba8c1d4dbf34a02c401d268ccfbb1b74f17
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/scripts/vnet/dhcp/proxy b/src/scripts/vnet/dhcp/proxy
new file mode 100644
index 0000000..c709d87
--- /dev/null
+++ b/src/scripts/vnet/dhcp/proxy
@@ -0,0 +1,21 @@
+loop create
+loop create
+
+set int state loop0 up
+set int state loop1 up
+
+set int ip  table loop1 1
+set int ip6 table loop1 1
+
+set int ip addr loop0 10.0.0.1/24
+set int ip addr loop0 10.0.1.1/24
+
+set int ip addr loop0 2001::1/64
+set int ip addr loop0 2001:1::1/64
+
+set dhcp proxy server 10.255.0.1 src-address 10.0.0.1 server-fib-id 0 rx-fib-id 0
+set dhcp proxy server 10.255.0.2 src-address 10.0.1.1 server-fib-id 1 rx-fib-id 1
+
+set dhcpv6 proxy server 3001::1 src-address 2001::1 server-fib-id 0 rx-fib-id 0
+set dhcpv6 proxy server 3002::1 src-address 2001:1::1 server-fib-id 1 rx-fib-id 1
+