Update pkg/kustomize to v0.1.0

If implemented this fixes a bug where retrieving the groupVersion.Group
of a kustomization were returning an empty string.

Signed-off-by: Soule BA <soule@weave.works>

cmd/flux/testdata/build-kustomization/var-substitution/cluster.json

@@ -0,0 +1,124 @@
+{
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": "-- Grafana --",
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "gnetId": null,
+  "graphTooltip": 0,
+  "iteration": 1636369574387,
+  "links": [],
+  "panels": [
+    {
+      "datasource": "${DS_PROMETHEUS}",
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "decimals": 0,
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 100
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 5,
+        "w": 6,
+        "x": 0,
+        "y": 0
+      },
+      "id": 24,
+      "options": {
+        "colorMode": "value",
+        "graphMode": "none",
+        "justifyMode": "auto",
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": [
+            "last"
+          ],
+          "fields": "",
+          "values": false
+        },
+        "text": {},
+        "textMode": "value"
+      },
+      "pluginVersion": "7.5.5",
+      "targets": [
+        {
+          "exemplar": true,
+          "expr": "count(gotk_reconcile_condition{namespace=~\"$operator_namespace\",exported_namespace=~\"$namespace\",type=\"Ready\",status=\"True\",kind=~\"Kustomization|HelmRelease\"})\n-\nsum(gotk_reconcile_condition{namespace=~\"$operator_namespace\",exported_namespace=~\"$namespace\",type=\"Ready\",status=\"Deleted\",kind=~\"Kustomization|HelmRelease\"})",
+          "interval": "",
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Cluster Reconcilers",
+      "type": "stat"
+    },
+    {
+      "collapsed": false,
+      "datasource": "${DS_PROMETHEUS}",
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 9
+      },
+      "id": 15,
+      "panels": [],
+      "title": "Status",
+      "type": "row"
+    }
+  ],
+  "refresh": "",
+  "schemaVersion": 27,
+  "style": "light",
+  "tags": [
+    "flux"
+  ],
+  "time": {
+    "from": "now-15m",
+    "to": "now"
+  },
+  "timepicker": {
+    "refresh_intervals": [
+      "10s",
+      "30s",
+      "1m",
+      "5m",
+      "15m",
+      "30m",
+      "1h",
+      "2h",
+      "1d"
+    ]
+  },
+  "timezone": "",
+  "title": "Flux Cluster Stats",
+  "uid": "flux-cluster",
+  "version": 1
+}