Fix flaky test in TopicControllerTest.java

[yannizhou05]

BUG REPORT

The test below in TopicControllerTest.java was found flaky because of the ordering of elements in result HashSet. The orders of elements in the HashSet were not the same every time being called. In this case, containsInAnyOrder was applied to ensure the orders do not cause the flakiness. This code change is trying to fix the flaky tests mentioned above, because they sometimes fail (as the picture showed) and sometimes pass. The failure could be reproduced by the commands above by using the tool of NonDex. The code change is to make sure the tests will always pass in this case.

• org.apache.rocketmq.dashboard.controller.TopicControllerTest.testList

The test failures could be reproduced by

1. mvn install -pl . -am -DskipTests
2. run tests with NonDex
   mvn -pl . edu.illinois:nondex-maven-plugin:2.1:nondex -Dtest=org.apache.rocketmq.dashboard.controller.TopicControllerTest#testList