Spec: Support extra specs in instance reservation
Spec: Support extra specs in instance reservation

Partially Implements: blueprint flavors-extra-specs
Change-Id: I3a7caceafbaad679d18263b2692791d276c1dd57

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