Vertical Pod Autoscaler : updater first version

[GFilipek]

Updater component for Vertical Pod Autoscaler described in kubernetes/community#338

Runs in loop. On one iteration performs:

• Fetching Vertical Pod Autoscaler configuration
• Fetching Pods information and resource allocation recommendations for pods.
• Calculating if pod update is required and how many replicas can be evicted
• Evicting pods if recommended resources significantly vary from actual resources allocation.

Mocked parts - to be implemented:

• Recommendation API for fetching data from Vertical Pod Autoscaler Recommender.
• Vertical Pod Autoscaler lister for fetching Vertical Pod Autoscaler config.

cc: @mwielgus @kgrygiel @KarolKraskiewicz

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This change is 

[bgrant0607]

@GFilipek

Please don't add something this big to contrib. See #762.

We should create a repo in kubernetes-incubator instead.

The process is described here:

https://github.com/kubernetes/community/blob/master/incubator.md