Make MasterModel attributes private using leading underscores
1. Avoiding attribute naming collisions when content writer's subclass Content.
2. Allow users to easily see which attributes are from pulpcore and therefore common to all content types.
Rename the MasterModel fields here in the following ways:
created -> _created
id -> _id
last_updated -> _last_updated
Also for the Content model itself
notes -> _notes
artifacts -> _artifacts
After making ^ change, go through pulp/pulp and update any references to the old field names. Once Pulp-smash passes w/ the new field names, you're done.
This will be a backwards incompatible Beta change for both plugin writers and users. As such, the PR needs the 'breaking-changes', 'rest-API', and 'plugin-writer' labels.
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