Add test for issue #2363

[rtretyak]

related to #2363

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This change is 

[surabujin]

Reviewed 2 of 2 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved

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services/src/functional-tests/src/main/groovy/org/openkilda/functionaltests/helpers/WfmManipulator.groovy, line 41 at r1 (raw file):

        if (wait) {
            dockerClient.waitContainer(wfmContainer.id())
            TimeUnit.SECONDS.sleep(WFM_WARMUP_SECONDS)

You can wait till container stops - because this constainer is up only when it manipulate with storm topologies. After that it stops. So this "delay" can be less than WFM_WARMUP_SECONDS.

[rtretyak]

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services/src/functional-tests/src/main/groovy/org/openkilda/functionaltests/helpers/WfmManipulator.groovy, line 41 at r1 (raw file):

dockerClient.waitContainer(wfmContainer.id())

waits for container to exit. The system takes far more time to actually become stable.