Escape environment variables, add things to the "docker create" container #66
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Make building an image slightly faster by putting shorter label definitions on a single line.
Since 6784a772baaa20936f00b8adc00a4b4444356181 or so, environment variable values have been evaluated as part of processing LABEL statements at build-time. Since we want to preserve these for when the "atomic" command runs them, escape them.
When we're installing a container, add the cgroups hierarchy to the list of volumes it'll need, since we're using systemd's init as the container entry point.
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LABEL statements in Dockerfiles have environment variables interpolated into them, so we need to escape them so that they won't be prematurely evaluated by the builder, so that they can be evaluated by "atomic".
The container that we create during "atomic install" needs the cgroups hierarchy to be mounted, since it's using systemd's init as its entry point, and its port 80 exposed, both to also agree with how we tell "atomic" to run the image.