d1cd60e990
Openstack has a unique derivative datasource that is gaining usage. Previously the config drive datasource provided part of this functionality as well as the ec2 datasource, but since new functionality is being added to openstack's special datasource it seems beneficial to combine the used parts into a new datasource just made for handling openstack deployments that use the openstack metadata service (possibly in combination with the ec2 metadata service). This patch factors out the common logic shared between the config drive and the openstack metadata datasource and places that in a shared helper file and then creates a new openstack datasource that readers from the openstack metadata service and refactors the config drive datasource to use this common logic.