camel-printer: more than one lpr + JobName + mockito

camel-printer only supports one configuration. I needed two lpr endpoints...

javax.print allows to set a JobName - nice in the webinterface of cups. from(...).setHeader(PrinterEndpoint.JOB_NAME, simple(${file:onlyname})).to("lpr://localhost/printer");

The new testcases should work without a printer configured. mockito seems to be in use by other components, too.