upstart: create new hierarchy for keyrings

This will provide more isolation between keys with different life-time
expectations.

BUG=chromium:1299635
TEST=builds and boots once deployed

Change-Id: Ic3c350707fc5a7a88698eed241ef0c3b4af9933b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/upstart/+/3479036
Reviewed-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Daniil Lunev <dlunev@chromium.org>
Tested-by: Daniil Lunev <dlunev@chromium.org>
1 file changed