'Gets the output of the ip link help command
Runs ip link help command and stores its output
Note: ip link help return error and writes its output to stderr
so we get the output from there. however, if this issue
will be solved and the command will write to stdout, we
will get the output from there too.'

@classmethod
def _get_ip_link_output(cls):

    try:
        ip_cmd = ['ip', 'link', 'help']
        (_stdout, _stderr) = utils.execute(ip_cmd, check_exit_code=False, return_stderr=True, log_fail_as_error=False)
    except Exception as e:
        LOG.exception(_LE('Failed    executing    ip    command'))
        raise UnsupportedIpLinkCommand(reason=e)
    return (_stdout or _stderr)
