[FLOC-4530] Pass the swappiness configuration value to the Docker API#2946

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wallrj wants to merge 7 commits intomasterfrom release-maintenance/flocker-1.15.0/swappiness-for-real-FLOC-4530

+106-10

Commits on Nov 9, 2016

Test that swappiness is used by StartApplication
wallrj
committed
Set the swappiness attribute of applications during discovery
wallrj
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A failing test demonstrating a bug in the current swappiness setting code
wallrj
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remove the broken code
wallrj
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Discover the swappiness value and set it on the Application....also requires us to use a newer docker API version and some corresponding changes to the cpu shares and memory discovery.
wallrj
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Since Docker API 1.19 the mem_limit is configured through HostConfig
wallrj
committed
Add a test that swappiness changes trigger an application restart
wallrj
committed