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The plugin runner uses fabric as the underlying mechanism for running remote commands on cluster hosts. fabric in turn uses paramiko, which generates a lot of log spew. This change seta parmiko's logging level to ERROR, eliminating excess logging. Additionally, it also constrains fabric's logging. Change-Id: I6229d64f95f9c1512cc01842c4a661e96e421086 Reviewed-on: http://gerrit.ent.cloudera.com:8080/1064 Reviewed-by: Ishaan Joshi <ishaan@cloudera.com> Tested-by: jenkins