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This change adds a check in ArcVmClientAdapter::StopArcInstance() to see
if a VM is running (current_cid_ is set). If not, skip calling
ConciergeClient::StopVm() and notify observers that ARCVM is stopped
right away.

BUG=b:169893632
TEST=arc.AuthPerf.unmanaged_vm

Change-Id: Ic927f122cacea0e89cacffbbcd67a217772dba43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462573
Commit-Queue: Willie Koomson <wvk@google.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816221}