Add plugin code

This adds basic plugins.
"main" types: veth, bridge, macvlan
"ipam" type: host-local

The code has been ported over from github.com/coreos/rkt project
and adapted to fit the CNI spec.

scripts/docker-run.sh

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+#!/bin/bash
+
+# Run a docker container with network namespace set up by the
+# CNI plugins.
+
+# Example usage: ./docker-run.sh --rm busybox /sbin/ifconfig
+
+contid=$(docker run -d --net=none busybox:latest /bin/sleep 10000000)
+pid=$(docker inspect -f '{{ .State.Pid }}' $contid)
+netnspath=/proc/$pid/ns/net
+
+./exec-plugins.sh add $netnspath
+
+function cleanup() {
+	./exec-plugins.sh del $netnspath
+	docker kill $contid >/dev/null
+}
+trap cleanup EXIT
+
+docker run --net=container:$contid $@
+

scripts/exec-plugins.sh

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+#!/bin/bash -e
+
+NETCONFPATH=${NETCONFPATH-/etc/cni/net.d}
+
+function exec_plugins() {
+	i=0
+	netns=$2
+	export CNI_COMMAND=$(echo $1 | tr '[:lower:]' '[:upper:]')
+	export PATH=$CNI_PATH:$PATH
+	export CNI_NETNS=$netns
+
+	for netconf in $(echo $NETCONFPATH/*.conf | sort); do
+		plugin=$(jq -r '.type' <$netconf)
+		export CNI_IFNAME=$(printf eth%d $i)
+
+		$plugin <$netconf >/dev/null
+
+		let "i=i+1"
+	done
+}
+
+if [ $# -ne 2 ]; then
+	echo "Usage: $0 add|del NETNS-PATH"
+	echo "  Adds or deletes the container specified by NETNS-PATH to the networks"
+	echo "  specified in \$NETCONFPATH directory"
+	exit 1
+fi
+
+exec_plugins $1 $2

scripts/priv-net-run.sh

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+#!/bin/bash -e
+
+# Run a command in a private network namespace
+# set up by CNI plugins
+
+netnsname=$(printf '%x%x' $RANDOM $RANDOM)
+netnspath=/var/run/netns/$netnsname
+
+ip netns add $netnsname
+ip netns exec $netnsname ip link set lo up
+./exec-plugins.sh add $netnspath
+
+
+function cleanup() {
+	./exec-plugins.sh del $netnspath
+	ip netns delete $netnsname
+}
+trap cleanup EXIT
+
+ip netns exec $netnsname $@