telemetry: do not return an error when identify hash file is malformed

[redbeam]

Fixes: Issue #4023

Solution/Idea

A malformed identify hash file should no longer trigger an error when reading it. Now there is a warning displayed and the hash file is treated like it doesn't exist yet. Therefore, it will be regenerated with the correct content.

Proposed changes

1. Add a warning log to the console with a description of what is wrong and what will happen.
2. Remove error from the return.

Testing

When the file does not exist yet, no warning should be shown. If it is malformed (does not contain exactly 8 bytes), the warning should show and after the program exits, the file should contain the correct hash.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfergeau, gbraad

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[openshift-ci]

@redbeam: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/integration-crc	cb46545	link	true	/test integration-crc

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[gbraad]

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