LeakSanitizer: detected memory leaks

[dennisklein]

We often get this on device shutdown, investigate, if this is an issue in our code:

Direct leak of 75 byte(s) in 1 object(s) allocated from:
    #0 0x7fa56832d68f in __interceptor_malloc (/lib64/libasan.so.8+0xba68f)
    #1 0x7fa566e801f0 in zmq_msg_init_size (/lib64/libzmq.so.5+0x651f0)

examples:

• https://cdash.gsi.de/testDetails.php?test=13584238&build=373072
• https://cdash.gsi.de/viewTest.php?onlyfailed&buildid=373152
• https://cdash.gsi.de/testDetails.php?test=13588357&build=373152
• https://cdash.gsi.de/testDetails.php?test=13588372&build=373152