Enrolled U2F tokens REST endpoint URL should contain user ID

[joonas-fi]

-		{ "chain": "authdQuery", "method": "GET", "path": "/u2f/enrolled_tokens", "produces": {"_": "list", "of": {"_": "U2FEnrolledToken"}}, "name": "u2fEnrolledTokens" }
+		{ "chain": "authdQuery", "method": "GET", "path": "/users/{userId}/enrolled_u2f_tokens", "produces": {"_": "list", "of": {"_": "U2FEnrolledToken"}}, "name": "u2fEnrolledTokens" }