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This change modifies ArcVmClientAdapter so that
arcvm-boot-notification-server upstart job is started during
StartMiniArc(). In UpgradeArc(), ArcVmClientAdapter sends
upgrade props to the server over the Unix socket.

make sure AVCA is able to successfully start and connect to the
server.

Bug: b:144542975
Test: Build and deploy_chrome. "restart ui", then look at logs to
Change-Id: I914770d4639eefd6cf3baa444d0288f0ae8a6dbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067613
Commit-Queue: Willie Koomson <wvk@google.com>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759415}