Deltacloud - Tests - adding testpoint for creating an image from a stopped instance - if supported

TrackedAt: http://tracker.deltacloud.org/patch/7f7d5800cbdfe3f288da30cb0050166c3a86b047
Deltacloud - Tests - adding blackbox tests for metrics, firewalls and load balancers

TrackedAt: http://tracker.deltacloud.org/patch/1047c2d5ad628b3e287b05d4e8e152daf46780f0