Dockerfile to replace Istio proxy configuration.

Add a Dockerfile to build a version of the proxy that has different
check_cache behavior.

proxy/Dockerfile

diff --git a/proxy/Dockerfile b/proxy/Dockerfile
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+++ b/proxy/Dockerfile
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+FROM istio/proxy:0.1.3
+
+COPY envoy.conf.template /etc/opt/proxy/envoy.conf.template
+

proxy/README.md

diff --git a/proxy/README.md b/proxy/README.md
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+++ b/proxy/README.md
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+# Proxy Docker image
+
+This directory contains a Dockerfile that will replace the Envoy
+configuration in the standard Istio proxy image with the configuration
+template in this directory.
+
+The main reason to change the configuration template here is to change
+the "check_cache_keys" parameter. With this change, the default
+Istio proxy will cache "check" results with the same URL. This change
+adds HTTP headers "apikey" and "Authorization" so that the caching
+will take authentication into account.

proxy/envoy.conf.template

diff --git a/proxy/envoy.conf.template b/proxy/envoy.conf.template
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index 0000000..e5984cc
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+++ b/proxy/envoy.conf.template
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+{
+  "listeners": [
+    {
+      "address": "tcp://0.0.0.0:${PORT}",
+      "bind_to_port": true,
+      "filters": [
+        {
+          "type": "read",
+          "name": "http_connection_manager",
+          "config": {
+            "codec_type": "auto",
+            "stat_prefix": "ingress_http",
+            "route_config": {
+              "virtual_hosts": [
+                {
+                  "name": "backend",
+                  "domains": ["*"],
+                  "routes": [
+                    {
+                      "timeout_ms": 0,
+                      "prefix": "/",
+                      "cluster": "service1",
+                      "opaque_config": {
+                        "mixer_control": "on",
+                        "mixer_forward": "off"
+                      }
+                    }
+                  ]
+                }
+              ]
+            },
+            "access_log": [
+              {
+                "path": "/dev/stdout"
+              }
+            ],
+            "filters": [
+              {
+                "type": "decoder",
+                "name": "mixer",
+                "config": {
+                  "mixer_server": "${MIXER_SERVER}",
+                  "mixer_attributes": {
+                      "target.uid": "POD222",
+                      "target.service": "foo.svc.cluster.local"
+                  },
+                  "quota_name": "RequestCount",
+                  "quota_amount": "1",
+		  "check_cache_expiration_seconds": 1,
+                  "check_cache_keys": [
+                      "request.host",
+                      "request.path",
+                      "origin.user",
+		      "request.headers/apikey",
+		      "request.headers/authorization"
+                  ]
+                }
+              },
+              {
+                "type": "decoder",
+                "name": "router",
+                "config": {}
+              }
+            ]
+          }
+        }
+      ]
+    },
+    {
+      "address": "tcp://0.0.0.0:7070",
+      "bind_to_port": true,
+      "filters": [
+        {
+          "type": "read",
+          "name": "http_connection_manager",
+          "config": {
+            "codec_type": "auto",
+            "stat_prefix": "ingress_http",
+            "route_config": {
+              "virtual_hosts": [
+                {
+                  "name": "backend",
+                  "domains": ["*"],
+                  "routes": [
+                    {
+                      "timeout_ms": 0,
+                      "prefix": "/",
+                      "cluster": "service2"
+                    }
+                  ]
+                }
+              ]
+            },
+            "access_log": [
+              {
+                "path": "/dev/stdout"
+              }
+            ],
+            "filters": [
+              {
+                "type": "decoder",
+                "name": "mixer",
+                "config": {
+                   "mixer_server": "${MIXER_SERVER}",
+                   "forward_attributes": {
+                      "source.uid": "POD11",
+                      "source.namespace": "XYZ11"
+                   }
+                }
+              },
+              {
+                "type": "decoder",
+                "name": "router",
+                "config": {}
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "admin": {
+    "access_log_path": "/dev/stdout",
+    "address": "tcp://0.0.0.0:9001"
+  },
+  "cluster_manager": {
+    "clusters": [
+      {
+        "name": "service1",
+        "connect_timeout_ms": 5000,
+        "type": "strict_dns",
+        "lb_type": "round_robin",
+        "hosts": [
+          {
+            "url": "tcp://${BACKEND}"
+          }
+        ]
+      },
+      {
+        "name": "service2",
+        "connect_timeout_ms": 5000,
+        "type": "strict_dns",
+        "lb_type": "round_robin",
+        "hosts": [
+          {
+            "url": "tcp://localhost:9090"
+          }
+        ]
+      }
+    ]
+  }
+}