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Fix race condition for consuming podIP via downward API

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Implemented first version of InitialResources plugin.

Fix scalability test suite

Fix a typo `-cadvisor_port` to `--cadvisor-port`

Where `-cadvisor_port` should be `--cadvisor-port`

Edit the community, discussion, and support section of the Kubernetes README

Create registrytest support for etcd test to reduce amount of boilerplate in tests

Stop supporting name field in resourcequota field selector

Docs: PullIfNotPresent -> IfNotPresent; PullAlways -> Always

Adjust the architecture diagram

Some modifications of the architecture diagram:

1. adjust the order of authz and authn; since the API server usually first authenticate user, if it is a valid user then authorize it
2. adjust the arrow to point to kubelet instead of to node of the second node
3. change `replication controller` to `controller manager(replication controller etc.)` which connects to the REST API Server
4. some tiny adjustments of the arrow position
5. affected files: architecture.svg, architecture.png and architecture.dia

Merge pull request #13301 from Huawei-PaaS/update_quota_example_in_admission_control_resource_quota_md

Update quota example in admission_control_resource_quota.md

Update quota example to track latest changes

Fixed typo in CentOS doc: api-servers arg

Fix buggy placement of imagePullPolicy in documentation example.

Revert "Revert "Don't take the proxy mutex in the traffic path""

Clean up the fluentd images to make them more debuggable

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Increase timeout to fix flaky tests

PR #13293 added a safety check to not remove a pod directory if the child
volumes directory is not empty. This logic is faulty because kubelet may have
directory structures podUID/volumes/volumeKind/volumeName. E.g.,
`056db95d-50ee-11e5-a2e4-42010af0ba1d/volumes/kubernetes.io~empty-dir/default-token-al3r2`

This change fixes that by properly listing all volumes under a pod.

PullIfNotPresent is the internal name in go code; IfNotPresent is the
user-facing value that is specified in json/yaml.  For docs, we should use the
user-facing string.

Similarly PullAlways -> Always

MESOS: rewrite Process implementation from scratch, unskip previously failing test

Add SharedCredentials Provider to AWS

Edit the community, discussion, and support section - add link to community page and cloud native computing foundation

Also fixed urls: Changed: GoogleCloudPlatform To: kubernetes

Revert "Don't take the proxy mutex in the traffic path"

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Aggregate errors when validate kubectl required parameters and labels

Don't take the proxy mutex in the traffic path