For ramdisk TLS (and other potential future enhancements) we need
to be able to inject configuration and certificates into the ramdisk.
Since we cannot pass files through kernel parameters, we need to
put them on the generated ISO or (in the future) config drive.
This change detects IPA configuration and copies it into the ramdisk
early enough for any configuration files to get picked.
Changed /dev/disk/by-label to blkid since the former may not exist
on all ramdisks (e.g. tinyIPA).
Change-Id: Ic64d7842a59795bbf02f194221dedc07c6b56e8c
b9b67fad77