code: def cmd_rollback_to(context):
    
    version = get_version_by_value(context, context.rollback_to)
    context.value = version.value
    context.commit_hash = version.commit_hash
    context.build_number = version.build_number
    context.location = version.location
    context.stable = True
    cmd_set(context)
docs: Roll back by finding a specific version in the history of the service and
    putting it as the new current version.
    Args:
      context: a populated EFVersionContext object