tests/test-filecache.py.out

perfmanifest: allow and require passing in a rev

Previously perfmanifest would only test tip.

basic:

creating
creating
creating
creating

fakeuncacheable:

creating
creating
creating
creating
creating
creating
repository tip rolled back to revision -1 (undo commit)
working directory now based on revision -1
repository tip rolled back to revision -1 (undo commit)
working directory now based on revision -1

setbeforeget:

0
creating
None