Maven Assembly Plug-in Listed Twice
Steps to reproduce
[WARNING] Some problems were encountered while building the effective model for org.opencastproject.assemblies:opencast-dist-allinone:karaf-assembly:2.1-SNAPSHOT
[WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-assembly-plugin @ org.opencastproject.assemblies:opencast-dist-allinone:[unknown-version], /home/rof/src/bitbucket.org/lkiesow/matterhorn/assemblies/dist-allinone/pom.xml, line 98, column 15
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
Merged PR 696 as 89062a7