[price-feeder] Change tick failure log to warning #702
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Describe your changes and provide context
Because tick failures are tolerated infrequently, it seems appropriate to downgrade the log message for failed ticks to a warning, which represents the incorrect behavior of that oracle's tick, but shouldn't affect future tick operation so it won't cause price feeder failure.
Testing performed to validate your change
patched and tested on a node running price feeder