Document setuptools entry points

[AstraLuma]

Salt supports adding directories to look for extmods in by querying setuptools entry points. However, this is not documented. This allows extensions for salt to be packaged and shipped via standard python packaging tools. However, you can only find this by looking at the source.

What I'm doing is:

    entry_points={
        'salt.loader': [
            '{0}_dirs=spirofs.loader:{0}'.format(tag)
            for tag in (
                'auth', 'beacons', 'cache', 'engines', 'executor', 'fileserver',
                'grains', 'log_handlers', 'module', 'pillar', 'render',
                'returner', 'runner', 'serializers', 'tokens', 'top', 'utils',
                'wheel',
            )
        ],
    },

[Ch3LL]

sounds like a great addition :)

[AstraLuma]

I'm actually not sure where this should live in the documentation. I thought there was a list of extmods somewhere?

Maybe there just needs to be a page outlining what extmods there are and what they do, with links to further information when available.

[AstraLuma]

Finally found the files.