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So currently if some optional openstack service is not installed metadata will fail when it tires to work on its config file. This commit adds in a check for the existance of each service config before running the gathering tasks. What might be a useful addition to this commit would be some logic for determining which services should never be missing and alerting the user. Change-Id: Ie360f062646cb5431de9ed21bd0dd193b84ddcda