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import1: use t.TempDir
This test was leaving files and directories under $PWD.
Use t.TempDir to avoid it.
import1: fix TestImport* cleanup
TestImport functions create some artefacts under /var/lib/machines which
require "machinectl remove" invocation to clean up.
Unfortunately, Import operations are async, meaning we either have to
listen to transfer events to ensure they are completed, or just sleep
for some time. Since this is a test I'd like to keep things simple.