lakitu: Upgrade to google-guest-agent

I ran all the validation tests for this change and they look
good: http://fusion/b8c9ca22-5b32-3d92-811d-d15544e2c4f9. Note that
shielded_vm_test is expected to fail since images in presubmit
builds are not signed. It looks like readonly_vm_test failed
due to some transient error; when I re-ran that test it passed
just fine: http://fusion/c7de2841-16ed-30eb-b4fc-2e86def45417.

There are really only two validation tests that we have to test this
change: account_manager_test.py and ssh_hostkey_publishing_test.py.
The next steps will be to expand our testing coverage.

BUG=b/153704310
TEST=presubmit; validation tests: fusion/b8c9ca22-5b32-3d92-811d-d15544e2c4f9
RELEASE_NOTE=Upgraded python based compute-image-packages to the new Go
based google-guest-agent v20201102.00

Change-Id: I0b39ac000e3efd38d64066f1550abb3575dc4b56
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/8284
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Reviewed-by: Roy Yang <royyang@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
8 files changed