Stats

[freignat91]

#12

Initial amp stat command implementation (based on proposal here).
Only cpu for now as decided

Not implemented

--time-unit
--status and --health (requires amp-agent/etcd)
current data (not historic)
Verification

$ amp stats --cpu --container --service-name=kafka --period 5m
Should display cpu metrics of all containers for the kafka service, for the last 5 miutes

$ amp stats --cpu --service --period 5m
Should display cpu metrics for all services, for the last 5 minutes

$ amp stats --cpu --node --period 5m
Should display cpu metrics for all nodes, for the last 5 minutes

$ amp stats --cpu --task --period 5m
Should display cpu metrics for all tasks, for the last 5 minutes

[subfuzion]

@freignat91 and @chrisccoy I just rebased with master and force pushed. Make sure you perform the following steps on your local branch:

$ git fetch origin stats
$ git reset --hard origin/stats

[subfuzion]

I just formatted the source and squashed commits. I'm going to go ahead and merge this even though it's a work in progress to make it easier to coordinate project-wide CLI restructuring.