Allow firewall access to port 5050 for discoverd
Merge pull request #80 from Divius/discoverd-firewall

Allow firewall access to port 5050 for discoverd
cinder-volume-nfs should not be installed on block storage nodes

The cinder-volume-nfs element is to be used on controllers, as
data traffic will not go through cinder-volume when backed by NFS
so there won't be any need for additional block storage nodes.

Block storage nodes default to LVM and should be used to take
advantage of the local storage in a pure scale-out scenario.
Merge pull request #82 from gfidente/cinder_nfs

cinder-volume-nfs should not be installed on block storage nodes
More workarounds in discovery ramdisk

Looks like existing are not enough on some Dell machines,
let us add more.