Use consistent package naming

[tdiesler]

Currently we have

io.fabric8.container.karaf   
io.fabric8.container.tomcat  
io.fabric8.container.wildfly     
io.fabric8.container.wildfly.connector   
io.fabric8.karaf.attributes  
io.fabric8.tomcat.attributes     
io.fabric8.wildfly.attributes

The attributes packages should move to their respective container packages (preferred). Alternatively 'container' could be dropped, which may grow confusing when more containers are added

[tdiesler]

Done