Several Fuse related artifacts (Fabric8 BOM, Camel Parent and Karaf) depends on commons-collections version "3.2.1.redhat-7" but this particular version of the artifact is not to be found in Maven repositories.

See:
http://origin-repository.jboss.org/nexus/content/groups/ea/io/fabric8/bom/fabric8-bom/1.2.0.redhat-621083/fabric8-bom-1.2.0.redhat-621083.pom

http://origin-repository.jboss.org/nexus/content/groups/ea/org/apache/camel/camel-parent/2.15.1.redhat-621083/camel-parent-2.15.1.redhat-621083.pom

http://origin-repository.jboss.org/nexus/content/groups/ea/org/apache/karaf/karaf/2.4.0.redhat-621083/karaf-2.4.0.redhat-621083.pom

In addition:
JBoss Fuse Parent artifact has a dependency on Fabric8 BOM so transitively the whole Fuse depends on the commons-collections' version which is missing.