Update api_fetch.go
Update api_fetch.go

The name by default in documentation is "nova".

http://docs.openstack.org/icehouse/install-guide/install/apt/content/nova-controller.html

This will allow proper selection when using packer.
jamiehannaford/gophercloud,rackspace/gophercloud,carolynvs/gophercloud,larsbutler/gophercloud,DSpeichert/gophercloud,larsbutler/gophercloud,feiskyer/gophercloud,trumant/gophercloud,rackspace/gophercloud,trumant/gophercloud,dudymas/gophercloud,dudymas/gophercloud,sti-jans/gophercloud,pratikmallya/gophercloud,rgbkrk/gophercloud,clintonskitson/gophercloud,pratikmallya/gophercloud,feiskyer/gophercloud,clintonskitson/gophercloud,DSpeichert/gophercloud,jarosser06/gophercloud,carolynvs/gophercloud,jarosser06/gophercloud,mitchellh/gophercloud-fork-40444fb,mitchellh/gophercloud-fork-40444fb,rgbkrk/gophercloud,timbyr/gophercloud,sti-jans/gophercloud,jamiehannaford/gophercloud,timbyr/gophercloud