test: actually run testCreateAccessFile
test: actually run testCreateAccessFile

We somehow neglected to include this in the integration tests.

Change-Id: I0d21a626026defa68cc06dc5720512975269762b
Reviewed-on: https://upspin-review.googlesource.com/18621
Reviewed-by: David Presotto <d244755566b06d4c956c05eb7fe29c9fb345f41e@gmail.com>
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

upspin/upspin,upspin/upspin