Use instead a configuration like so [1]
It's yaml but it should be a python dict ;)

scheduler: 
  cls: remote
  args:  
    url: http://localhost:5008 [2]

[1] https://forge.softwareheritage.org/source/puppet-swh-site/browse/production/data/defaults.yaml$1285-1287

[2] default port for scheduler instance is https://forge.softwareheritage.org/source/puppet-swh-site/browse/production/data/defaults.yaml$1136

That way, that becomes simpler here:

self.scheduler = get_scheduler(**self.config['scheduler'])

Also it matches consistently what we do elsewhere.

Default should be for a developer machine so it should work out of the box.
~> Use the port 5008

It's also consistent with other modules.
(and if the other modules don't do that, it's wrong ;)

We should make that 'indexer_mimetype' now, 'indexer_language', etc...
That'd be the task_type.

'indexer_*' to convey that's indexer related information.

Update on task_type where we need to are at:

• D615
• D614