mod_auth_oauth_external: Support PLAIN via resource owner password grant Might not be supported by the backend but PLAIN is the lowest common denominator, so not having it would lock out a lot of clients.

2c07bcf56a36d6e74dc0f5422e89bd61f4d31239 0.8-diverge
1656d4fd71d07aa3a52da89d4daf7723a555e7dd last-google-code-commit