Return which jails are set to be run

    CLI Example:

    .. code-block:: bash

        salt '*' jail.get_enabled

def get_enabled():
    '''
    Return which jails are set to be run

    CLI Example:

    .. code-block:: bash

        salt '*' jail.get_enabled
    '''
    ret = []
    for rconf in ('/etc/rc.conf', '/etc/rc.conf.local'):
        if os.access(rconf, os.R_OK):
            with salt.utils.files.fopen(rconf, 'r') as _fp:
                for line in _fp:
                    line = salt.utils.stringutils.to_unicode(line)
                    if not line.strip():
                        continue
                    if not line.startswith('jail_list='):
                        continue
                    jails = line.split('"')[1].split()
                    for j in jails:
                        ret.append(j)
    return ret