Add mping. Mping is a system for collecting packet delay and loss
statistics in a TCP/IP network using ICMP echo.
Mping is based on original ping(8) with following new features:
- Ability to ping multiple hosts simultaneously
- Prints 10/50/90-percentile as well as min/avg/max.
Submitted by: Babak Farrokhi <firstname.lastname@example.org>