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Label the very slow pod disk tests [Slow].

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This is used for user configuration overrides in cluster/. We should not
enforce the boilerplate headers in this file.
Signed-off-by: Mike Danese <mikedanese@google.com>

Signed-off-by: Mike Danese <mikedanese@google.com>

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Add `kube-reserved` and `system-reserved` flags for configuration
reserved resources for usage outside of kubernetes pods. Allocatable is
provided by the Kubelet according to the formula:
```
Allocatable = Capacity - KubeReserved - SystemReserved
```

Also provides a method for estimating a reasonable default for
`KubeReserved`, but the current implementation probably is low and needs
more tuning.

Move upgrade jobs to version control

If there is any successful detection of kubelet.service,
fetch the kubelet logs using journalctl.

Node labels: Remove node-labels-file command line option.  Change --n…

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api server library: Extracting out code to run a http server

Node labels: Remove node-labels-file command line option.  Change --node-label format from key=value to key:value to be consitent with how the header key:value is specified on command line.