GEANT maps support with lat/lon coordinates

[srichmond]

Background

The maps plugin has been created to give a graphical representation of the information stored in the orchestrator.
This can be used to "navigate" your subscriptions or to show different overlays. The current implementation is very much geared around Géant implementation of core links:

• get the list of active core-links subscriptions
• walk through these subscription and build the graph made of edges (core links) and vertex (sides of the core-link that eventually point to a site that has LAT and LONG)
• put this graph on a map.

It also allows to:

• graphically signal if a subscription is insync or OoS
• add overlays to the map.

Would be nice to make it generic so that others can use it.

Implementation

A configuration is needed to:

• map edges and vertexes to the correct subscriptions/product_blocks
• list the attributes of the edges that you want to have as overlay.

Probably the graph creation logic can stay as it is and just need adjustments in terms of naming to keep it generic