Rename "auto" subcommands to "image"

This means all the sub-subcommands can drop the `image-` prefix,
making them shorter and more fluent.

E.g.,

    flux create image policy

rather than

    flux create auto image-policy

Signed-off-by: Michael Bridgen <michael@weave.works>

cmd/flux/get_image_repository.go

@@ -0,0 +1,66 @@
+/*
+Copyright 2020 The Flux authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/spf13/cobra"
+
+	imagev1 "github.com/fluxcd/image-reflector-controller/api/v1alpha1"
+)
+
+var getImageRepositoryCmd = &cobra.Command{
+	Use:   "repository",
+	Short: "Get ImageRepository status",
+	Long:  "The get image repository command prints the status of ImageRepository objects.",
+	Example: `  # List all image repositories and their status
+  flux get image repository
+
+ # List image repositories from all namespaces
+  flux get image repository --all-namespaces
+`,
+	RunE: getCommand{
+		names: imageRepositoryNames,
+		list:  imageRepositoryListAdapter{&imagev1.ImageRepositoryList{}},
+	}.run,
+}
+
+func init() {
+	getImageCmd.AddCommand(getImageRepositoryCmd)
+}
+
+func (s imageRepositoryListAdapter) summariseItem(i int, includeNamespace bool) []string {
+	item := s.Items[i]
+	status, msg := statusAndMessage(item.Status.Conditions)
+	var lastScan string
+	if item.Status.LastScanResult != nil {
+		lastScan = item.Status.LastScanResult.ScanTime.Time.Format(time.RFC3339)
+	}
+	return append(nameColumns(&item, includeNamespace),
+		status, msg, lastScan, strings.Title(strconv.FormatBool(item.Spec.Suspend)))
+}
+
+func (s imageRepositoryListAdapter) headers(includeNamespace bool) []string {
+	headers := []string{"Name", "Ready", "Message", "Last scan", "Suspended"}
+	if includeNamespace {
+		return append(namespaceHeader, headers...)
+	}
+	return headers
+}