Fix CI failure caused by ROS docker
Fix CI failure caused by ROS docker

Health checking without waiting is too frequent. Use 0.5 second as the
interval between every attempt.

NOTE: CI failure caused by this usually cannot be seen the exact test
case in the gradle log. But it will give you something like:
"Tests on Nexus 5X - 6.0 failed: Test run failed to complete. Expected
3762 tests, received 3"

realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java