KUDU-1078. Reduce raft_consensus-itest flakiness
KUDU-1078. Reduce raft_consensus-itest flakiness

The DFATAL we put in place in the previous patch in this series was
causing unit test flakiness, so we'll use ERROR for now.

Change-Id: If90e592fce0da107d8642cd8b53aee73749cb49f
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/8446
Reviewed-by: David Alves <33ea948168c114d220e0372a903be6ee60f6396e@cloudera.com>
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@cloudera.com>
Tested-by: jenkins

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