api call to get data in shell friendly format

[ktsaou]

It would be nice to support something like this:

eval "$(curl http://localhost:19999/api/v1/chart=system.cpu&format=shell&after=-600&options=unaligned)"

This should create the variables SYSTEM_CPU_SYSTEM, SYSTEM_CPU_USER, SYSTEM_CPU_WAITIO, etc (one for each dimension of the chart), having the average utilization of the last 600 seconds.

[simonnagl]

I think we can close this.

[ktsaou]

you are right!

for anyone looking at this: #1504