Added timestamp to BEP redis key behind feature flag #1251

[rafaelre898]

Description

Please include a summary of the changes and the related issue. Please also
include relevant motivation and context.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please also list any relevant details for your test configuration

Checklist

• Updated documentation if needed
• Tests added/amended
• bazel test //... passes locally
• PR is contained in a single commit, using git amend see some docs

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This change is 

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[kubevalet]

Can you describe why this is needed?