[3.x][Test Fix] Disconnecting worker when the test finishes

[drodriguezhdez]

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What does this PR do?

This PR is a fix for a test that checks the hostname. Depending on the node that executed the pipeline, the hostname is null or none. Apparently, the test is executed by other workers created in different tests. The PR disconnects the created workers to fulfill the expected behavior in the test.

This started failing when the Jenkins version for integration tests was upgraded in this PR (#287)

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