fakestat should preclude afsdb lookups too

fakestat should preclude afsdb lookups too

macos tries to look up ._foo stuff. correctly identify those (mvstat 2, not
1) and also use tryEvalOnly to preclude AFSDB lookups

Change-Id: I490fe98d695c4d230210bc4e4645ea20cd4d8fa2
Reviewed-on: http://gerrit.openafs.org/1228
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 682db4d64d550af86dc5a09786e050c6a98ffb0c)
Reviewed-on: http://gerrit.openafs.org/1232