OAuth: remove hard coded groups_by_applications and users cache from OAuthCookieFilter

[bamthomas]

Is your feature request related to a problem? Please describe.

This is related to the PR #1583
For projects ACL's and api key we use a user cache in Redis. This cache is overridden at each login.
The project ACL is used for example by DocumentRessource to check if users have access to a project by getProjects/getProjectNames in User.java. It is finally using the field groups_by_applications returned by the Identity Provider.

Describe the solution you'd like

1. the cache should be made by another implementation class so the line writableUsers().saveOrUpdate(datashareUser); could be in a subclass of the OAuth2CookieFilter.processOAuthApiResponse
2. the user field containing the project could have another location in the json. It is now in groups_by_applications.datashare but it could be located elsewhere in the json returned by the Identity Provider. That could allow other deployments to use the IP configuration for project ACL without using another persistence location.

Additional context
see
When cache has been introduced #504.
latest refactor #1395