[dc-ops] Inventory management packages

[Tait Clarridge]

> http://racktables.org/ is another alternative open source package.
> 
> Also check out http://redmine.nocproject.org/projects/noc/wiki
> 

The redmine NOC project was interesting to setup considering the
instructions were missing some steps, but other than that it looks to
have a ton of features (the VRF tracking is very nice to have in IPAM
software) . Still missing the inventory section and a few other things,
but hopefully development continues.