Add Linux CP: create 'dataplane' network namespace, move to init-container.sh to do the plumbing

files/init-container.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+CONFIG=${CONFIG:="/etc/vpp/startup.conf"}
+NETNS=${NETNS:="dataplane"}
+
+echo "Creating dataplane namespace"
+/usr/bin/mkdir -p /etc/netns/$NETNS
+/usr/bin/touch /etc/netns/$NETNS/resolv.conf
+/usr/sbin/ip netns add $NETNS
+
+echo "Starting VPP"
+exec /usr/bin/vpp -c $CONFIG