We clean up start-impala-cluster.py in general in this patch by using
logging instead of "print" and formatting strings using the format()
function. We make sure to include a timestamp in each log message in
order to make it easier to debug failures in custom cluster tests that
happen when starting the cluster.
Change-Id: I60169203c61ae6bc0a3ccd3dea355799b603efe5
Reviewed-on: http://gerrit.cloudera.org:8080/10780
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
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