[skip ci] fix outdated config sample

Author: timfeirg

core.yaml.sample

@@ -16,7 +16,8 @@ image_cache: 2
 git:
     public_key: "***REMOVED***"
     private_key: "***REMOVED***"
-    gitlab_token: "***REMOVED***"
+    token: "***REMOVED***"
+    scm_type: "gitlab"
 
 docker:
     log_driver: "json-file"
@@ -47,4 +48,4 @@ timeout:
     remove_image: 600
     backup: 600
     common: 600
-    realloc: 600
+    realloc: 600