Fix filter scheduler settings in DevStack plugin
Fix filter scheduler settings in DevStack plugin

Some necessary scheduler filters for instance reservation are not
enabled by the DevStack plugin. This patch fixes the problem.

Change-Id: I07a959b36578f3ec9188f5b86593bbbba6370b58
Closes-Bug: #1719278

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