Return a list of all available services

    .. versionchanged:: 2016.3.4

    jail: optional jid or jail name

    CLI Example:

    .. code-block:: bash

        salt '*' service.get_all

def get_all(jail=None):
    '''
    Return a list of all available services

    .. versionchanged:: 2016.3.4

    jail: optional jid or jail name

    CLI Example:

    .. code-block:: bash

        salt '*' service.get_all
    '''
    ret = []
    service = _cmd(jail)
    for srv in __salt__['cmd.run']('{0} -l'.format(service)).splitlines():
        if not srv.isupper():
            ret.append(srv)
    return sorted(ret)