saltstack/salt — pull request #8551 by s0undt3ch (2013-11-15 10:42:21+00:00)
Title: Quiet down Yum's logging. Fixes #3855.

Salt does not need any of `sys.stdout`, `sys.stderr` and `syslog` logging handlers which are configured by Yum, specially because we're using Yum as an API, not as another CLI tool. Any logging will go through salt's logging handlers.