Add emptyDir volume support to kube play

When a kube yaml has a volume set as empty dir, podman
will create an anonymous volume with the empty dir name and
attach it to the containers running in the pod. When the pod
is removed, the empy dir volume created is also removed.

Add tests and docs for this as well.

Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>

libpod/options.go

@@ -1413,9 +1413,10 @@ func WithNamedVolumes(volumes []*ContainerNamedVolume) CtrCreateOption {
 			}
 
 			ctr.config.NamedVolumes = append(ctr.config.NamedVolumes, &ContainerNamedVolume{
-				Name:    vol.Name,
-				Dest:    vol.Dest,
-				Options: mountOpts,
+				Name:        vol.Name,
+				Dest:        vol.Dest,
+				Options:     mountOpts,
+				IsAnonymous: vol.IsAnonymous,
 			})
 		}