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This key is PII, so to avoid exposing it through mount point name we
hash it with salt.

BUG=chromium:829694

Change-Id: I5c66ff64715026b7acc984c387b41760a2fb99b1
Reviewed-on: https://chromium-review.googlesource.com/1143119Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Sergei Datsenko <dats@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577762}