Cache bypass: fix use of incorrect "states"

Cache bypass: fix use of incorrect "states"

Test and set the correct field for cache bypass flags.  There was
some confusion between cachingStates and the states associated with
vcache entries in a few places.

Change-Id: Iae957b6f838a44d75776e49662b4aba685800d19
Reviewed-on: http://gerrit.openafs.org/3637
Reviewed-by: Matt Benjamin <matt@linuxbox.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>