Consolidate ab tests output

[hwndept]

Goal

To consolidated report at the end of npm test command so it will be easy to compare the results of different frameworks

A/C

1. Consolidated report provided at the end of npm test command in a format:

app	complete requests	failed requests	requests per second	time per request	time per request(across all concurrent)
node	x1	x2	x3	x4	x5
node-express	y1	y2	y3	y4	y5
...	...	...	...	...	...