iotests: Use _rm_test_img for deleting test images
Just rm will not delete external data files. Use _rm_test_img every time we delete a test image. (In the process, clean up the indentation of every _cleanup() this patch touches.) ((Also, use quotes consistently. I am happy to see unquoted instances like "rm -rf $TEST_DIR/..." go.)) Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NMaxim Levitsky <mlevitsk@redhat.com> Message-id: 20191107163708.833192-16-mreitz@redhat.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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