Rewrite subworkflow resume/pause tests
These tests were subject to race and this is even more true since we moved to threading. Let's rewrite them in a more logical and simplified way. I tried to keep the original idea of each test. I also renamed them for simplicity. Change-Id: I80006baccf8809cfa4ec554b2aaef1a4ed8ba4ce Signed-off-by: Arnaud M <arnaud.morin@gmail.com>
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