[idu] Add /etc/network/interfaces specifid to the IDU

recipes-bsp/netbase/netbase/sysmocom-idu/interfaces

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+# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
+
+# The loopback interface
+auto lo
+iface lo inet loopback
+
+# eth0 is attached to the IDU-internal managed switch
+# in the future we will use VLANs to use individual switch ports as
+# break-out interfaces.  For now we simply do DHCP.
+iface eth0 inet dhcp
+
+#eth1 is our admin interface and will provide dhcp to clients
+auto eth1
+iface eth1 inet static
+	address 10.23.24.1
+	netmask 255.255.255.0
+	network 10.23.24.0
+
+# eth2 is attached to the IDU-internal SOB-JB02-SW
+auto eth2
+iface eth2 inet manual
+	pre-up ifconfig $IFACE up
+	pre-down ifconfig $IFACE down
+
+# * br0 is a bridge interface on top of eth2
+# * we use the bridging code so we can run mstpd and become the root bridge
+
+auto br0
+iface br0 inet manual
+	bridge_ports eth2
+	bridge_maxwait 0
+
+# VLAN 6: management VLAN
+auto br0.6
+iface br0.6 inet static
+	address 172.16.2.1
+	netmask 255.255.254.0
+	network 172.16.2.0
+
+# 172.16.1.1 is the service IP address for SOBMGMT
+auto br0.6:0
+iface br0.6:0 inet manual
+	address 172.16.1.1
+	netmask 255.255.255.255