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When authenticating via OAuth, the resource owner password grant strategy is allowed by Mastodon, but (without this PR), it does not attempt to authenticate against LDAP or PAM. As a result, LDAP or PAM authenticated users cannot sign in to Mastodon with their email/password credentials via OAuth (for instance, for native/mobile app users). This PR fleshes out the authentication strategy supplied to doorkeeper in its initializer by looking up the user with LDAP and/or PAM when devise is configured to use LDAP/PAM backends. It attempts to follow the same logic as the Auth::SessionsController for handling email/password credentials. Note #1: Since this pull request affects an initializer, it's unclear how to add test automation. Note #2: The PAM authentication path has not been manually tested. It was added for completeness sake, and it is hoped that it can be manually tested before merging.