In working on the confluent_kafka version of ts_salobj I found a few issues that I want to back-port to DDS salobj, including:

• ReadTopic.aget may steal a value from the next, despite documentation to the contrary.
• BaseCscTestCase.make_csc has a race condition in how it creates the remote and CSC
• A few tests have race conditions.
• test_command_isolation in test_topics does not work as advertised, and the advertised behavior makes for a better test.

Note that the race conditions probably have not been causing any problems, but it's safest to fix them in any case.