cmd/upspinfs: use AllFilesGlob when listing a directory
cmd/upspinfs: use AllFilesGlob when listing a directory

Change-Id: Icae26a5cc028a5def4794a3ecae99780f7219df8
Reviewed-on: https://upspin-review.googlesource.com/10700
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

upspin/upspin,upspin/upspin