SW-516: partial fix... We can now use the TemporaryQueue as a 'bus' during tests. But this test still does not work because we cannot send datetime-instances over the bus in the current implementation. Fixing that in a next commit in the messagebus

This includes:
- python executable -> python3
- Help texts
- #! specifications
- Shell scripts

SW-516: fixed t_tbbserver for python3/qpid. Left the test in its original state of incompleteness. At least it passes now (nothing is really tested).

SW-516: fixed test_cleanup_service_and_rpc for python3/qpid. Left the test in its original state of incompleteness. At least it passes now (nothing is really tested).

SW-516: fixed test_storagequery_service_and_rpc for python3/qpid. Left the test in its original state of incompleteness. At least it passes now (nothing is really tested).

SW-516: remove 'options' from messagebus classes, as these were qpid options, and we're using proton now. At this moment there is no need for such options. These can be added later when needed.

SW-516: made generic fix for handling python2 <-> python3 subprocess output. Used that in cep4_utils.

SW-516: made generic fix for handling python2 <-> python3 subprocess output. Used that in cep4_utils.

SW-516: made LTAIngestTransferServer code python3 compliant. Fixed tests. Used new TemporaryQueue class for qpid testing