Proposed changes

This MR will revert the changes introduced in the MR(#233). We have removed the keepalived dependency on the Nginx Instance Manager.

Solution:Keepalived should be installed by customer manually when setting up the NIM HA availability.

Testing: Reverting to existing working copy only.

Please focus on (optional): If you any specific areas where you would like reviewers to focus their attention or provide
specific feedback, add them here.

If this PR addresses anissue on GitHub, ensure that you link to it here:

Closes #ISSUE

Checklist

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• I have read thecontributing guidelines
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• I have ensured my PR is targeting the main branch and pulling from my branch from my own fork
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• If the change involves potentially sensitive changes¹, I have assessed the possible impact
• If applicable, I have added tests that prove my fix is effective or that my feature works
• I have ensured that existing tests pass after adding my changes
• If applicable, I have updatedREADME.md andCHANGELOG.md