Options to reduce size of sar data collected

Red Hat, Inc. would like to considerably reduce the size of the sar data collected. We present two options, "skip_sar_reports", where no sar?? files are collected, or .xml files generated, and "data_file_limit", which places a cap on the number of raw sa?? data files collected in the report.

This request also fixes the hard-coded /var/log/sa references.