node conf: supply resource_limit.conf examples

Bug 1133936 - Provide some usable canned resource_limits profiles
https://bugzilla.redhat.com/show_bug.cgi?id=1133936
Ah sorry missed it above.  I still have the question about tuning this for m3.large and the others for m3.xlarge.

I would vote to tune for m3.xlarge and lower the max active to not be too aggressive ootb.  So cpu shares of 200000 unthrottled and max active around 60/30/15  (small/medium/large).