add error log for machine update

[rudoi]

What this PR does / why we need it:

This PR adds logging when an error is returned by machine actuator Update().

Release note:

additional logging on machine update errors

[k8s-ci-robot]

Hi @rudoi. Thanks for your PR.

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[vincepri]

/ok-to-test
/approve
/assign @detiber

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rudoi, vincepri

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[vincepri]

/lgtm