mantle/kola: use separate unit for pulling COSA in iscsi tests #4011
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We've seen errors in the RHCOS pipeline where the iSCSI tests are hitting the 10m timeout. We could bump the timeout, but first let's try pulling the COSA image in a separate unit so that it can happen in parallel with the install over iSCSI so that when we're ready to start the VM the image is already there.