devserver: Update collect_cros_au_log RPC to return the host logs.

The collect_cros_au_log RPC currently returns just the executing log.
We will need it to return the host logs saved during the update so that
the autoupdate_EndToEndTest test can analyse them.

TEST=dev_server.auto_update() and verify that the host logs are saved
into job.resultdir when the test is finished.

Change-Id: I7cf14a81da5481ba8474de9cf1d115280eb93dda
Commit-Ready: David Haddock <>
Tested-by: David Haddock <>
Reviewed-by: Xixuan Wu <>
2 files changed