Ensure the bandwith plugin chooses the host veth device

When chained with a plugin that returns multiple devices, the bandwidth
plugin chooses the host veth device.

Signed-off-by: Tyler Schultz <tschultz@pivotal.io>

integration/testdata/basic-bridge/network-chain-test.json

@@ -0,0 +1,12 @@
+{
+  "cniVersion": "0.3.1",
+  "name": "network-chain-test",
+  "type": "bridge",
+  "bridge": "test-bridge-0",
+  "isDefaultGateway": true,
+  "ipam": {
+    "type": "host-local",
+    "subnet": "10.11.2.0/24",
+    "dataDir": "/tmp/foo"
+  }
+}

integration/testdata/chained-bridge-bandwidth.conflist

@@ -1,20 +0,0 @@
-{
-    "cniVersion": "0.3.1",
-    "name": "chained-bridge-bandwidth",
-    "plugins": [
-        {
-            "type": "bridge",
-            "ipam": {
-                "type": "host-local",
-                "subnet": "10.11.2.0/24"
-            }
-        },
-        {
-            "type": "bandwidth",
-            "ingressRate": 800,
-            "ingressBurst": 200,
-            "egressRate": 800,
-            "egressBurst": 200
-        }
-    ]
-}

integration/testdata/chained-bridge-bandwidth/network-chain-test.conflist

@@ -0,0 +1,23 @@
+{
+    "cniVersion": "0.3.1",
+    "name": "network-chain-test",
+    "plugins": [
+        {
+            "type": "bridge",
+            "bridge": "test-bridge-0",
+            "isDefaultGateway": true,
+            "ipam": {
+                "type": "host-local",
+                "subnet": "10.11.2.0/24",
+                "dataDir": "/tmp/foo"
+            }
+        },
+        {
+            "type": "bandwidth",
+            "ingressRate": 8000,
+            "ingressBurst": 16000,
+            "egressRate": 8000,
+            "egressBurst": 16000
+        }
+    ]
+}