Step: shell
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Run a shell snippet on the host. This is not run in a chroot, and can
access the host system.

Step keys:

* `root-fs` &mdash; REQUIRED; value is the tag for the root filesystem.

* `shell` &mdash; REQUIRED; the shell snippet to run

Example (in the .vmdb file):

    - root-fs: root
      shell: |
          echo I am in NOT in chroot.
