Use named logger for leader election

[sesmi123]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Uses a child logger in leader election module instead of logging to the root logger.

Which issue(s) this PR fixes:

Fixes #2364

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

No functional changes. Behaviourally, users can now set log level like `logging.getLogger("leaderelection").setLevel(logging.INFO)`

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sesmi123
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