Define empty default objects for docker package management.
On CoreOS where there is no package management, perform zero-trip loops instead of throwing an exception for iterating over a member of an undefined variable.
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@ -1 +1,10 @@
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docker_version: 1.10
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docker_package_info:
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pkgs:
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docker_repo_key_info:
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repo_keys:
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docker_repo_info:
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repos:
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