runtime: Handle the transient store options

This handles the transient store options from the container/storage
configuration in the runtime/engine.

Changes are:
 * Print transient store status in `podman info`
 * Print transient store status in runtime debug output
 * Add --transient-store argument to override config option
 * Propagate config state to conmon cleanup args so the callback podman
   gets the same config.

Note: This doesn't really change any behaviour yet (other than the changes
in containers/storage).

Signed-off-by: Alexander Larsson <alexl@redhat.com>

libpod/define/info.go

@@ -118,6 +118,7 @@ type StoreInfo struct {
 	ImageStore      ImageStore        `json:"imageStore"`
 	RunRoot         string            `json:"runRoot"`
 	VolumePath      string            `json:"volumePath"`
+	TransientStore  bool              `json:"transientStore"`
 }
 
 // ImageStore describes the image store.  Right now only the number