Move type LabelSelector and type LabelSelectorRequirement from pkg/apis/extensions
This avoids an import loop when Job (and later DaemonSet, Deployment, ReplicaSet)
are moved out of extensions to new api groups.

Also Move LabelSelectorAsSelector utility from pkg/apis/extensions/ to pkg/api/unversioned/
Also its test.
Also LabelSelectorOp* constants.
Also the pkg/apis/extensions/validation functions ValidateLabelSelectorRequirement and
ValidateLabelSelector move to pkg/api/unversioned

The related type in pkg/apis/extensions/v1beta1/ is staying there.  I might move
it in another PR if neccessary.

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Adding test for apiserver example

Don't handshake with each watch interrupt in proxy unittests.

rkt: Add DNS support

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Use `kubectl create secret` wherever possible
instead of defining a complete object.

Reorganized some content.

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Move MinReadySeconds out of RollingUpdateDeployment

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Make sure at least one interrupt is buffered before dropping.

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NodeSelector, HardNodeAffinity and SoftNodeAffinity implementation

Revert to Go 1.4.2

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Remove e2e global 'timeout'

Fix DeleteCollection in FakeClient

Make it easier to debug pod IP flakes for downward API

Fix wrong timeout param to wget

kube-proxy tries to apply latest snapshot

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Service e2e cleanup  and factoring