Additional metadata reported by mongoebench

The mongoebench utility generates a JSON report which contains information about operations performed. Additional metadata should be captured in the report which includes the following:

• Test information
  • Test name
  • Thread count
  • Test start time
  • Test end time
  • Test time (end time - start time)
  • Test CPU time
  • Seed used in test
• Environment
  • Platform/Architecture (uname -a)
  • Number of CPUs
  • CPU speed (MHz)