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Switching to FVM will give us a functioning blobstore, a prerequisite
for installing packages, and allows the Fuchsia team to follow through
with bootfs deprecation.

Also added a missing package reference to local-sdk.py that caused it
to skip building the Fuchsia userspace.

Bug: 802331
Change-Id: I6cfc45c51dae97bef3c9f7a202f74fff483d5c50
Reviewed-on: https://chromium-review.googlesource.com/919266
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539512}