Code Cleanup: Re-factor k8s-pod-recovery to handle failure conditions

[Ghada Khalil]

Brief Description
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This is a follow-up on a comment in the following code review: https://review.opendev.org/c/starlingx/integ/+/793837

Specifically:
Jim Somerville
kubernetes/k8s-pod-recovery/centos/files/k8s-pod-recovery
Line 170
I guess what I'm trying to say here is that I wouldn't necessarily block this code from going in, but would feel better if there is a story captured somewhere to improve the error paths in this script.

This LP will investigate what code cleanup should be pursued.

Severity
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Low - no reported issues now

Steps to Reproduce
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Expected Behavior
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Actual Behavior
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Reproducibility
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System Configuration
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Branch/Pull Time/Commit
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stx master

Last Pass
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Timestamp/Logs
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Test Activity
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Workaround
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