Standardise the names of types

Most commands use either a kind, or a more readable spelling of a
kind, in their output. To make this easier, this centralises the
definition of those names in one place, and lets the command
implementations choose whichever they need.

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

cmd/flux/get.go

@@ -75,8 +75,8 @@ func nameColumns(item named, includeNamespace bool) []string {
 var namespaceHeader = []string{"Namespace"}
 
 type getCommand struct {
-	headers []string
-	list    summarisable
+	names
+	list summarisable
 }
 
 func (get getCommand) run(cmd *cobra.Command, args []string) error {
@@ -98,7 +98,7 @@ func (get getCommand) run(cmd *cobra.Command, args []string) error {
 	}
 
 	if get.list.len() == 0 {
-		logger.Failuref("no imagerepository objects found in %s namespace", namespace)
+		logger.Failuref("no %s objects found in %s namespace", get.kind, namespace)
 		return nil
 	}