Inject log level via CLI flag; add debug logging for incoming requests

[modulitos]

What this PR does / why we need it:

Allow users to inject the log level via a --loglevel flag. It is info by default, which is also the default for the logrus logger.

Adds a debug log statement to log incoming HTTP requests.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes # N/A

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: modulitos
Once this PR has been reviewed and has the lgtm label, please assign jyotimahapatra for approval. For more information see the Kubernetes Code Review Process.

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[bryantbiggs]

/ok-to-test

[bryantbiggs]

/lgtm

[micahhausler]

are we sure we want this? It'll dump all tokens to logs

[modulitos]

Good point... I'll update this to only log safe fields from the request

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