Some more commands to consider

[cgag]

http://techblog.netflix.com/2015/11/linux-performance-analysis-in-60s.html

I need to see which are already covered, and which binaries are/aren't shipped with coreos, but I wanted to dump this resource before I forgot.

[tschuy]

Looking through these, several of them aren't available on CoreOS or give duplicate information:

• vmstat returns information found in /proc/meminfo, /proc/vmstat, and other things collected
• mpstat, pidstat, iostat, and sar aren't included on CoreOS or my fedora machine
• top isn't really necessary if we're already collecting all the other commands

Interestingly, we don't collect dmesg, uptime as far as I can tell, or load average. I'll probably pull those last two in from /proc/uptime and /proc/loadavg, though, to avoid the overhead of running a command and instead just the overhead of the uptime.c call.

I'll ask around about whether we want to add dmesg.

[tschuy]

fixed by #64