(QENG-807) add --collect-perf-data option, rspec tests, and yard docs

If beaker is run with "--collect-perf-data" it will ensure sysstat is installed and configured on the Linux hosts before testing begins. After testing is finished, a sar report is sent to logging for each Linux host.
Does this need to be initialized before the logger exists?  By creating the object slightly later in the cli you would no longer need to pass the logger separately.