UI is using API to request scripts with full content

While looking through the MAAS logs I noticed that the UI is repeatedly requesting

/MAAS/api/2.0/scripts/?include_script=true

This uses the API to return all scripts including their content. The API returns historic data so not only does this include script content but the content for every version of a script. The API also includes other data which the UI is not currently using.

On a fresh MAAS install with no script history the returned size is as follows:

/MAAS/api/2.0/scripts/ - 36K
/MAAS/api/2.0/scripts/?include_script=true - 258K

This causes a lot of unnecessary load on the region and alot of unnecessary data over the network which can effect slow connections. This also seems to happening repeatedly so content is not cached.

1. MAAS has a websocket to return script data. It does not currently have a way to return content but that can be easily added.
2. Script content should be loaded as needed. IMHO its better to wait a second for each script to load when viewing content then to load it all at once. I discovered this while on the nodes-listing page where you can't view script content.