[maven] Verify whether fabric-maven should serve SNAPSHOTs from defaultRepositories

org.ops4j.pax.url.mvn.defaultRepositories=\

    file:${runtime.home}/${karaf.default.repository}@snapshots@id=karaf.${karaf.default.repository},\

    file:${runtime.home}/local-repo@snapshots@id=karaf.local-repo,\

    file:${karaf.base}/${karaf.default.repository}@snapshots@id=child.karaf.${karaf.default.repository}