Clean up DevStack plugin code
Clean up DevStack plugin code

This patch fixes typos and removes code that is uncessary since commit
9d5265ea82d5375bfbe49706459ba782ac6c448d was merged in blazar-nova.

Change-Id: Ibd53ad4a602ef2273feea35df1c2a49083e4cd67

openstack/blazar,stackforge/blazar,ChameleonCloud/blazar,stackforge/blazar,openstack/blazar,ChameleonCloud/blazar