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This CL makes the Linux host service create a symlink to the latest host
log file, so that it can be easier to locate.

Bug: 1124862
Change-Id: I5a16d530ba3270e2441154f74d4ba543628343af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2393058
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Erik Jensen <rkjnsn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804453}