Ref inter dependencies cleanup

[dseurotech]

This PR intends to clean up the internal dependencies between kapua modules. In most cases, it just cleans up the pom.xml files from dependencies which are already received transitively via maven (e.g.: if you already depend on the -internal module, it is implicit the dependence from the -api module). In a few cases data classes have been moved closer to the project that use them -e.g.: IsJobRunningMultipleResponse.java is specific to the job engine and does not need to be in the commons-rest-model module.