Refactore the Load Balancer Controller

[duanjiong]

Remove useless controllers , such as zone, node,etc.
The api is introduced to describe the objects in the load balancer, for example eip, lb, listener, backend etc.
Fix some issues, such as #101, #98, #81, #63
Fix incorrect vip display when there are multiple private ip's.

Signed-off-by: Duan Jiong [email protected]

[duanjiong]

/cc @zheng1

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[calvinyv]

@duanjiong @zheng1 make sure this change will not break any existing functions, the regression testing should be fully covered the existing functions.

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