Create 'neutron-router' image element

To enable Neutron DVR support, this change introduces the 'neutron-router'
image element, which mirrors the current 'neutron-network-node' element
except it does not have a dependency on the neutron-dhcp-agent element
as that element should not be included on the compute nodes in the
Neutron Distributed Virtual Routing model.

Change-Id: I487ece637b75f8ef3ce0390f2da093b9f123a8d9
blueprint: support-neutron-dvr

elements/neutron-router/README.md

@@ -0,0 +1,16 @@
+Install components for Neutron router node.
+
+Configuration
+-------------
+
+No router node specific configuration exists. See the
+neutron-openvswitch-agent element for configuration parameters.
+
+A typical ovs configuration will set:
+
+    neutron:
+      ovs:
+        enable_tunneling: 'True'
+        public_interface: eth0
+        physical_bridge: br-ex
+        tenant_network_type: gre

elements/neutron-router/element-deps

@@ -0,0 +1,4 @@
+neutron
+neutron-openvswitch-agent
+os-refresh-config
+pkg-map

elements/neutron-router/install.d/neutron-source-install/80-arping

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+#!/bin/bash
+set -eux
+
+install-packages -m neutron-router arping_package

elements/neutron-router/install.d/neutron-source-install/80-neutron-router

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+#!/bin/bash
+set -eux
+
+# If NEUTRON_VENV_DIR is set, then need to fix up the l3.filters rootwrap file to allow l3-agent to
+# kill metadata-proxy processes when routers are deleted.
+if [ -n "${NEUTRON_VENV_DIR}" ]
+then
+    sed -i "s, /usr/bin/python, ${NEUTRON_VENV_DIR}/bin/python," /etc/neutron/rootwrap.d/l3.filters
+fi
+
+os-svc-daemon -i "$NEUTRON_VENV_DIR" -n neutron-l3-agent -u neutron -c neutron-l3-agent -- --config-file /etc/neutron/l3_agent.ini --config-dir /etc/neutron
+os-svc-daemon -i "$NEUTRON_VENV_DIR" -n neutron-metadata-agent -u neutron -c neutron-metadata-agent -- --config-file /etc/neutron/metadata_agent.ini --config-dir /etc/neutron
+
+# This has to be on the path of the agent that runs it http://pad.lv/1182704
+ln -sf $NEUTRON_VENV_DIR/bin/neutron-ns-metadata-proxy /usr/bin

elements/neutron-router/os-refresh-config/post-configure.d/80-neutron-router

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+#!/bin/bash
+set -eux
+
+os-svc-enable -n neutron-metadata-agent
+os-svc-enable -n neutron-l3-agent
+
+os-svc-restart -n neutron-metadata-agent
+os-svc-restart -n neutron-l3-agent

elements/neutron-router/pkg-map

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+{
+  "family": {
+    "debian": {
+      "arping_package": "iputils-arping"
+    }
+  },
+  "default": {
+    "arping_package": "iputils"
+  }
+}