External IP implementation

[jorgevgut]

Big issue to track external ip implementation on webui.
Main requirements.

• user interface
• API implementation

Relates Issues:

• Add External IP API support: list external IPs  #241 - Add External IP API support: list external IPs

• Add External IP API support: pool management #242 - Add External IP API support: pool management
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• Implement Pool Overview Component to the Admin page #235 - Implement Pool Overview Component to the Admin page

• Implement List of Pools in the Admin page #236 - Implement List of Pools in the Admin page

• Create New IP Pool page #237 - Create New IP Pool page

• Implement External IP on Tenant Instance Detail #238 - Implement External IP on Tenant Instance Detail

[jorgevgut]

Current related issues on which this feature depends.
#241
#242

#235 - Implement Pool Overview Component to the Admin page
#236 - Implement List of Pools in the Admin page
#237 - Create New IP Pool page
#238 - Implement External IP on Tenant Instance Detail