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Also adds debug logging for qemu-img invocations in the qemu target.

Bug: 1046861
Change-Id: Ia37a9701391e3437cf03f1f041ddca671d5e0770
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023387
Commit-Queue: Stephen Roe <steveroe@google.com>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740058}