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This is in-line with the nomenclature used in
crostini/concierge/cicerone/etc. This is also needed because in a
forthcoming CL we will need to know the container name separately from
the VM name.

Bug: b/162562622
Change-Id: I05cbe5d803bebe351fe57e2214895ae284d7f0b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469418Reviewed-by: Daniel Ng <danielng@google.com>
Commit-Queue: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#817188}