test.sh: fix race condition in safe_download()
test.sh: fix race condition in safe_download()

Moved the check if the downloaded file already exist inside the safe
block to avoid race condition.

Signed-off-by: Daniel Belenky <1481b7e02b8c8cdcdfab769d02924b7df2a647b6@redhat.com>

davidvossel/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt