[benchmarks] Add a container for bonnie++

[mcolmant]

Bonnie++ is a program to test hard drives and file systems for performance or the lack therof. There are a many different types of file system operations which different applications use to different degrees. Bonnie++ tests some of them and for each test gives a result of the amount of work done per second and the percentage of CPU time this took. For performance results higher numbers are better, for CPU usage lower are better (NB a configuration scoring a performance result of 2000 and a CPU result of 90% is better in terms of CPU use than a configuration delivering performance of 1000 and CPU usage of 60%).

There are two sections to the program's operations. The first is to test the IO throughput in a fashion that is designed to simulate some types of database applications. The second is to test creation, reading, and deleting many small files in a fashion similar to the usage patterns of programs such as Squid or INN.