8371503: RETAIN_IMAGE_AFTER_TEST do not work for some tests

[sendaoYan]

Hi all,

The DockerTestUtils.RETAIN_IMAGE_AFTER_TEST variable which read the property from "jdk.test.docker.retain.image" do not work for some of the docker tests, such as jdk/internal/platform/docker/TestDockerCpuMetrics.java, only works for some of the docker tests, such as jdk/internal/platform/docker/TestPidsLimit.java.

This PR read the DockerTestUtils.RETAIN_IMAGE_AFTER_TEST inside function removeDockerImage instead of before all the fucntion removeDockerImage. This will make all the docker tests receive the property jdk.test.docker.retain.image.

Change has been verified locally on linux-x64 by run the all touched tests.

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Issue

• JDK-8371503: RETAIN_IMAGE_AFTER_TEST do not work for some tests (Bug - P4)

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