debug cronjob failure on Prow

[qiliRedHat]

Run relialibity-v2 on prow, I saw 2 differences compared to running on jumphost

1. cronjob failure

   2024-01-11 09:36:38,694 - INFO - [User: testuser-16] [Task: /tmp/svt/reliability-v2/tasks/script/cronjob.sh -n 10]: will be run
   2024-01-11 09:36:38,694 - INFO - => /tmp/svt/reliability-v2/tasks/script/cronjob.sh -n 10
   2024-01-11 09:36:38,699 - ERROR - /tmp/svt/reliability-v2/tasks/script/cronjob.sh -n 10 
   2 : /tmp/svt/reliability-v2/tasks/script/cronjob.sh: 20: function: not found
   Usage: cronjob.sh [-n <number of cronjobs>] [-s <schedule>] -d
   -n <number>                  : Number of cronjobs to be created. Default is 1.
   -s <schedule>                : Schedule for the cronjob. Default is '*/1 * * * *'
   -d                           : Delete all cronjobs and
   /tmp/svt/reliability-v2/tasks/script/cronjob.sh: 30: Syntax error: "}" unexpected

   When I manually run this script on the prow pod, it did not have this issue. I tired to run the same python version as the prow pod 3.9.9 on my local, I can not reproduce the issue too. Added 'set -x' to get more info to debug

2. load app failure rate is higher on prow pod (7% in aws 8 hours run), it could be related to the prow pod's network config or condition. Reduce the load test client number from 10 to 1 to see if the failure rate can get down.

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[liqcui]

/lgtm