We can run rolling upgrades from version X to version Y.
The thing is that different versions have different urn:infinispan:server:endpoint:?.? and urn:infinispan:server:core:?.? versions.

We need to reflect that in rolling upgrades tests... we will set up defaults, but we will also need to pass properties like:

-Dold.server.schema.version (e.g. 6.0)
-Dnew.server.schema.version (e.g. 7.0)

Also test reports will safe logs with respective affixes.