<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def create_jail(name, arch, version="9.0-RELEASE"):
    '''
    Creates a new poudriere jail if one does not exist

    *NOTE* creating a new jail will take some time the master is not hanging

    CLI Example:

    .. code-block:: bash

        salt '*' poudriere.create_jail 90amd64 amd64
    '''
    # Config file must be on system to create a poudriere jail
    _check_config_exists()

    # Check if the jail is there
    if is_jail(name):
        return '{0} already exists'.format(name)

    cmd = 'poudriere jails -c -j {0} -v {1} -a {2}'.format(name, version, arch)
    __salt__['cmd.run'](cmd)

    # Make jail pkgng aware
    make_pkgng_aware(name)

    # Make sure the jail was created
    if is_jail(name):
        return 'Created jail {0}'.format(name)

    return 'Issue creating jail {0}'.format(name)