move ifupdown2/* .

ifupdown2 code was one level deeper because ifupdown2 initially
had ifupdown2 and ifupdown2-addons as two separate packages.
Since they were combined into one package, it makes sense to
move all combined code under the top level directory

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>

docs/examples/vlan_aware_bridges/interfaces.with_clag

@@ -0,0 +1,87 @@
+#
+# vlan-aware bridge with clag example
+#
+#
+# 'bridge' is a vlan aware bridge with ports:
+#      'peer-bond spine-bond glob host-bond-0[1-2]'
+#
+# All ports inherit 'vlans 10 20-23' from the 'bridge-vids' attribute
+# under the bridge
+# 
+# native vlan is by default 1
+#
+# 'bridge-vids' attribute is used to declare vlans.
+# 'bridge-pvid' attribute is used to specify native vlans if other than 1
+# 'bridge-access' attribute is used to declare access port
+# 
+# 'spine-bond host-bond-0[1-2]' are clag bonds and will be considered by
+# clagd for dual connection. clag-id has to be a non-zero and has to match
+# across the peer switches for the bonds to become dual connected.
+
+# spine bond
+#
+auto spine-bond
+iface spine-bond
+      bond-slaves glob swp19-22
+      bond-mode 802.3ad
+      bond-miimon 100
+      bond-use-carrier 1
+      bond-lacp-rate 1
+      bond-min-links 1
+      bond-xmit-hash-policy layer3+4
+      clag-id 100
+
+# mlag bond and peer interface
+#
+auto peer-bond
+iface peer-bond
+      bond-slaves glob swp23-24
+      bond-mode 802.3ad
+      bond-miimon 100
+      bond-use-carrier 1
+      bond-lacp-rate 1
+      bond-min-links 1
+      bond-xmit-hash-policy layer3+4
+
+# sub-interface for clagd communication
+#
+auto peer-bond.4094
+iface peer-bond.4094
+      address 169.254.0.1/30
+      clagd-peer-ip 169.254.0.2
+      clagd-sys-mac 44:38:39:ff:00:01
+      #clagd-priority 4096
+      # Please see man clagd for more options
+      # clagd-args --peerTimeout 30
+
+# host ports
+#
+auto host-bond-01
+iface host-bond-01
+      bond-slaves swp1
+      bond-mode 802.3ad
+      bond-miimon 100
+      bond-use-carrier 1
+      bond-lacp-rate 1
+      bond-min-links 1
+      bond-xmit-hash-policy layer3+4
+      clag-id 1
+
+auto host-bond-02
+iface host-bond-02
+      bond-slaves swp2
+      bond-mode 802.3ad
+      bond-miimon 100
+      bond-use-carrier 1
+      bond-lacp-rate 1
+      bond-min-links 1
+      bond-xmit-hash-policy layer3+4
+      clag-id 2
+
+# the bridge
+auto bridge
+iface bridge
+      bridge-vlan-aware yes
+      bridge-ports peer-bond spine-bond glob host-bond-0[1-2]
+      bridge-stp on
+      bridge-vids 10 20-23