BGP VPN implementation

[velp]

BGP VPN feature is now available for the end-users. We have to add a new TAB for "Networks & Routers" section in the dashboard. This TAB must:

1. show list of available bgpvpns for project (API ref: https://docs.openstack.org/api-ref/network/v2/index.html#list-bgp-vpns)
2. provide controls to manage router associations (API ref: https://docs.openstack.org/api-ref/network/v2/index.html#create-router-association)

Functionality

The end-user should be able to:

1. see the list of available bgpvpns in project
2. create/update/delete router associations for available bgpvpns

Columns for the list BGPVPN table:

• Name - field name from the response
• Associated Routers - field routers from the response
• Owning Project - field project_id from the response
• Shared - field shared from the response

Columns for the details page:

Tab Overview:

• ID - field id from the response
• Name - field name from the response
• Routers - field routers from the response
• Project - field project_id from the response
• Shared - field shared from the response
• Type - field type from the response
• Import Targets - field import_targets from the repsonse
• Export Targets - field export_targets from the response

Tab Routers (table of associated routers) columns:

• Name / ID - name and id of associated router
• Networks - IDs and subnets of private networks on the router

Also, this Tab should contain controls to add/delete router associations.

[andypf]

implemented!