Add service management commands. (i.e. service ssh restart)
Log a warning when a driver won't have any roles run on it.
Add a commented-out debug log message for .erb file rendering.
Add a FIXME to command_exited_with_exit_code.
Implement commands in TextFileCommands; add stub for replace_text_in_file.
Allow for execution of commands by other users using sudo.
Clean up PackageManagement command module.
Add a helper for adding a public key to a user's ~/.ssh/authorized_keys file.
Add a helper for adding users/groups.