fix logfile and pidfile of supervisor for non root environment

[dotmobo]

fix logfile and pidfile of supervisor for non root environment

Relevant issues

Fixes #17264

Pre-Submission checklist

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• [ x ] My PR passes all unit tests on make test-unit
• [ x ] My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix

Changes

Use /tmp instead of the current workdir to put logfile and pidfile of supervisor

[vercel]

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