mocknet: set mainnet consensus timing parameters (#10908)

the default config produced by neard init gives us different times
between blocks than what we have on mainnet. Changing this to the
mainnet values will make the test conditions closer to production

pytest/tests/mocknet/helpers/neard_runner.py

@@ -272,6 +272,10 @@ def neard_init(self, rpc_port, protocol_port, validator_id):
         config['network']['skip_sync_wait'] = False
         config['genesis_records_file'] = 'records.json'
         config['rpc']['enable_debug_rpc'] = True
+        config['consensus']['min_block_production_delay']['secs'] = 1
+        config['consensus']['min_block_production_delay']['nanos'] = 300000000
+        config['consensus']['max_block_production_delay']['secs'] = 3
+        config['consensus']['max_block_production_delay']['nanos'] = 0
         if self.is_traffic_generator():
             config['archive'] = True
         with open(self.tmp_near_home_path('config.json'), 'w') as f: