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DeamonSet->DaemonSet

This reverts commit c64048d7.

Address #17332.

kubelet: add a generic pod lifecycle event generator

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Remove a comment that disabled the redirection of output destined for
`/etc/salt/minion.d/grains.conf`. Must have been a commented added to
debug the generation of the line, to view it on `STDOUT`.

Install libapparmor1 in kubekins-test image

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The "Kubelet regular resource usage tracking over 30m0s with 0 pods per node"
was broken and fixed after the v1.1.1 cut, by pull request #14603. Trusty
release jobs always pin to the latest release version of k8s, so we would have
to wait until next 1.1 release to pick up the fix. Temporarily skipping that
test for Trusty jobs now.

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Update get-kube.sh with libvirt provider (with CoreOS as a guest operating system) - https://github.com/kubernetes/kubernetes/blob/master/docs/getting-started-guides/libvirt-coreos.md

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- implement ExternalID in Mesos cloud provider. This is used by the node
  controller to detect disappeared nodes.
- add test case for ExternalID

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Just sync the documentation up since the latest [virt7-docker-common-release](http://cbs.centos.org/koji/packages?tagID=112) has newer packages that work together.

Tested this on a single node Centos 7.1 node with the following packages and it all works well so far:

```
 yum list -q docker etcd kubernetes flannel
Installed Packages
docker.x86_64                                1.8.2-7.el7.centos                                  @extras
etcd.x86_64                                  2.1.1-2.el7                                         @extras
flannel.x86_64                               0.2.0-10.el7                                        @extras
kubernetes.x86_64                            1.1.0-0.4.git2bfa9a1f.el7                            @virt7-docker-common-release
```

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beta.gcr.io is no longer needed to pull through v2.