Currently the script assigns the two manifests in a wrong way, and only one of the manifests is in fact used.

We need to change maven invocation from:

mvn org.wildfly:wildfly-channel-maven-plugin:upgrade -DmanifestFile=file1 -DmanifestFile=file2 ...

to such:

mvn org.wildfly:wildfly-channel-maven-plugin:upgrade -DmanifestFile=file,file2 ...

Additionally, we should make it ignore all the maven artifacts streams in the manifest (org.apache.maven:, org.apache.maven.resolver:, plexus.*), which are not intended for EAP but for provisioning tooling.