This is to make it easier to run the integration testsuite with XP installations provisioned using specific manifests.

Both plugin versions allow to specify the wildfly.channels system property, which can contain a list of manifest URLs or Maven GAVs.

One can use it such as:

mvn clean install -DallTests \
    -Dwildfly.channels=file:path/to/base/manifest.yaml,file:path/to/xp/manifest.yaml

There are no more public releases for these plugin streams, so we need to switch for the productized versions in EAP pom.xml.