This supports ext4 partitions with metadata_csum(as created
by ubuntu bionic by default).
Also Using it with the e1000 virt driver cirros sees the nics.
This allows us to remove 2 of the special cases we had inserted
when the CI jobs were switched to bionic.
Change-Id: I68165110dd57ed314cbc29430f84ff5092065d38
Story: #2004604
Task: #28570
Task: #28499
1effd562ed