Build codecgen from Godeps in update-codecgen.sh

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Fixes #12122

This commit builds on previous work and creates an independent
worker for every liveness probe. Liveness probes behave largely the same
as readiness probes, so much of the code is shared by introducing a
probeType paramater to distinguish the type when it matters. The
circular dependency between the runtime and the prober is broken by
exposing a shared liveness ResultsManager, owned by the
kubelet. Finally, an Updates channel is introduced to the ResultsManager
so the kubelet can react to unhealthy containers immediately.

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increase NUM_MINIONS for jenkins gce upgrade test

deep-copies: Structs cannot be nil

Add unit test for StoreToJobLister

disabled parallel provisioning in vagrant