afs: Do not avoid DNLC if fakestat is set

Currently in afs_lookup we avoid putting an entry in the DNLC if
'force_eval' is unset, in order to avoid populating the DNLC with
mountpoint symlinks (we want the target of the mountpoint to be in
there instead, the root dir). However, if -fakestat or -fakestat-all
are enabled, 'force_eval' is always false, since we only set it to
true under certain circumstances when evaluating mountpoints.

To fix this, populate the dnlc for non-mountpoints, even if force_eval
is unset.

Reviewed-on: http://gerrit.openafs.org/7431
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 35d5be2adf2456e26aa6b10935352dc19eb6b3f2)

Change-Id: I32f859c4478432de65025f35ae0c484ff7fa1bf0
Reviewed-on: http://gerrit.openafs.org/9494
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>