Clean false error logs in price feeder

[robert-zaremba]

Summary

Errors should be handled by error values, not logs at the origination.
These creates lot of spam messages in Peggo

Problem Definition

We constantly see the following blocks produced by oracle module in Peggo:

1. ERR oracle tick failed error="error on computing tvwap for quote:
2. [umeed.service] 1:38AM ERR Stopping peer for error err=EOF module=p2p peer={"Data":{},"Logger":{}}
3. [peggod.service] 4:05PM ERR Error on receive message length=74 provider=huobi

Proposal

1. don't log errors in library code. Instead return errors.

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