Add system test to measure recovery after partition (#20902)

* Add system test to measure recovery after partition

* shellcheck

* increase partition length until failure

* adjust parameters and output

* different stopping condition

system-test/testnet-automation-json-parser.py

@@ -1,5 +1,9 @@
 #!/usr/bin/env python3
-import sys, json
+import sys, json, argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("--empty_error", action="store_true", help="If present, do not print error message")
+args = parser.parse_args()
 
 data=json.load(sys.stdin)
 
@@ -7,7 +11,7 @@ if 'results' in data:
    for result in data['results']:
       if 'series' in result:
          print(result['series'][0]['columns'][1] + ': ' + str(result['series'][0]['values'][0][1]))
-      else:
+      elif not args.empty_error:
          print("An expected result from CURL request is missing")
-else:
+elif not args.empty_error:
    print("No results returned from CURL request")