/usr/share/ipa/domainlevel.ldif is in freeipa-server 4.7.0~pre1+git20180411-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # Create default Domain Level for new masters
dn: cn=Domain Level,cn=ipa,cn=etc,$SUFFIX
changetype: add
objectClass: top
objectClass: nsContainer
objectClass: ipaDomainLevelConfig
ipaDomainLevel: $DOMAIN_LEVEL
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