Kokoro automation - Log rotation using logrotate

[raj-prince]

Description

1. We were using a workaround branch to support log-rotation for kokoro-automation. Now, we will use logrotate package to support log-rotation for kokoro-automation.

Current change requires only for dino model. I'll create a separate PR for tf-automation.

2. Also, changing the kokoro-job time to 7 days instead of 16 days.

Testing

1. Manual - Tested on the fresh machine, it's working fine.
2. Integration - NA
3. Unit - NA