cache: implement workaround for access denied error
cache: implement workaround for access denied error

Bug: 1098265
Change-Id: I08e7f4782e3565c18a038eb2ba818c0ca0c4ae45
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2262515
Reviewed-by: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go