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/resume.go

@@ -44,9 +44,8 @@ type resumable interface {
 }
 
 type resumeCommand struct {
-	kind      string
-	humanKind string
-	object    resumable
+	names
+	object resumable
 }
 
 func (resume resumeCommand) run(cmd *cobra.Command, args []string) error {