Fix metadata for oauth2. Fixes gh-811.

spring-cloud-openfeign-core/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -75,7 +75,7 @@
 			"defaultValue": "false"
 		},
 		{
-			"name": "spring.cloud.openfeign.oauth2.registrationClientId",
+			"name": "spring.cloud.openfeign.oauth2.clientRegistrationId",
 			"type": "java.lang.String",
 			"description": "Provides a clientId to be used with OAuth2.",
 			"defaultValue": ""