Tests are added that verify that when a tag is being set on an (EBS) volume or on an instance that upon retrieval
from the resource, the tag are set on the instance.  Important is that the tags are set using create_tags but that
the presence is validated by getting the resource using either (get_all_volumes or get_all_instances).

When running the tests using nosetests it shows that the tags for the instances are correctly retrieved but the tags
for the volume are missing