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DeamonSet->DaemonSet

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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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.

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