Integrationtests for iceoryx_posh

[dkroenke]

Brief feature description

We need to enhance the existing integrationtests under iceoryx_posh/test/integrationtest with more testcases. Tests can use the RouDi Environment and and GTest verify the functionality of integrating the different posh software modules (e.g. verifying that the mempool config works.)

***Note: This ticket shall not enhance the testcases in iceoryx_integrationtest because this package is under construction.

Possible testcases (to be extended later)

• [ ] test double startup prevention of RouDi run() with RouDi Environment
• [ ] test mempool config with different shm segments tied to different users (please note that there are testusers created here: https://github.com/eclipse-iceoryx/iceoryx/blob/master/tools/add_test_users.sh)
• [ ] add test for compatibility check and version within RouDi context https://github.com/eclipse-iceoryx/iceoryx/tree/master/iceoryx_posh/include/iceoryx_posh/version
• [ ] test sending complex data types (which contain cxx::vector, cxx::optional etc...)
• [ ] Add a integration test which kills and restarts the apps in the monitoring window iox-roudi ./iox-ex-subscriber kill -9 [iox-ex-subscriber pid]& ./iox-ex-subscriber (comes from #662)

Feel free to add more testcases.

[dkroenke]

@marthtz