Fix boot duration timing calculation
Fix boot duration timing calculation

We were reporting the time it took to boot an instance every time we
discovered that it was configured, even if we had not just rebooted it.

Change-Id: Ide0fd91eab3dec5133bf2f6212fc43f751692a8a

stackforge/akanda-rug,dreamhost/akanda-rug,markmcclain/astara,openstack/akanda-rug,openstack/akanda-rug,stackforge/akanda-rug