pax-exam-helper should switch to offline mode when -o switch used

[bertfrees]

No description provided.

[bertfrees]

If pax-exam-helper were a Maven plugin this would be possible:

/**
 * Flag whether Maven is currently in online/offline mode.
 */
@Parameter( defaultValue = "${settings.offline}", readonly = true )
private boolean offline;

however it is not a plugin so somehow another plugin (e.g. build-helper in pipeline-mod-braille) should inject this parameter into the test and the test should pass it to the bundlesAndDependencies.