KEYCLOAK-1750 Improve first time login with social. Added 'first broker login' flow

common/src/main/java/org/keycloak/common/util/ObjectUtil.java

@@ -13,7 +13,7 @@ public class ObjectUtil {
      * @param str2
      * @return true if both strings are null or equal
      */
-    public static boolean isEqualOrNull(Object str1, Object str2) {
+    public static boolean isEqualOrBothNull(Object str1, Object str2) {
         if (str1 == null && str2 == null) {
             return true;
         }