how to make the slave use NetworkManager

[yangj]

i wrote the following in the /root/lnst/lnst-slave.conf  file,it was in 
slave  machine

[cache]
cache_dir = ./cache
expiration_period = 7days
[environment]
log_dir = ./Logs
use_nm=yes


but in Control machine ,It will appear as follows：

2019-01-17 00:46:09       (localhost)        - WARNING: NetworkManager 
is running on a slave machine!
2019-01-17 00:46:09       (localhost)        - WARNING: Usage of NM is 
disabled!
2019-01-17 00:46:09       (localhost)        - WARNING: 
=============================================

it's true???