system test configuration fix

system/t02_config/ConfigShowTest_gold

@@ -29,6 +29,7 @@
     "gpgProvider": "gpg",
     "gpgDisableSign": false,
     "gpgDisableVerify": false,
+    "gpgKeys": [],
     "skipContentsPublishing": false,
     "skipBz2Publishing": false,
     "FileSystemPublishEndpoints": {},

system/t02_config/ConfigShowYAMLTest_gold

@@ -27,6 +27,7 @@ download_sourcepackages: false
 gpg_provider: gpg
 gpg_disable_sign: false
 gpg_disable_verify: false
+gpg_keys: []
 skip_contents_publishing: false
 skip_bz2_publishing: false
 filesystem_publish_endpoints: {}