[mapsapi] - base configuration for batch API

[sabman]

@mnzaki so upon more investigation of trying to run the Analysis Tools - the following issue seems to be related to the configuration of the Batch API in mapsapi service. To reproduce try the following for the user:

dev@acme.org I'll message you the pass

Error is:

{"type":"analysis","message":"Unable to enqueue SQL API batch job","analysis":{"id":"a1","type":"moran"}}

Current analysis config block has:

"analysis": {
    "batch": {
      "endpoint": "http://127.0.0.1:8080/api/v2/sql/job",
      "hostHeaderTemplate": "{{=it.username}}.localhost.lan"
    },
  },

I think it should be

"analysis": {
    "batch": {
      "endpoint": "http://0.0.0.0:8080/api/v2/sql/job",
      "hostHeaderTemplate": "{{=it.username}}.localhost.lan"
    },
  },

I'm not sure exactly what hostHeaderTemplate should be but I suspect it doesn't matter yet since we are using the IP to reference the host for now. What do you think?

Also when you first load the map you will see the client services error too.

[sabman]

OK Just changed it on the server and rebuild and restarted the image but no joy. 😢

[mnzaki]

I believe that endpoint should be the sqlapi endpoint, or actually just the router (so that the port can be avoided). I changed it to point be http://cartodb-router/api/v2/sql/job and want to give it a go.
I also looked for hostHeaderTemplate in the windshaft code, and it's unclear what it is used for. It's also left as .localhost.lan in the production config provided with windshaft.