Pass the node name for a host onto/from which to pull/clean the images.
For doing this, I used:

- rfsim 4G eNB_IPAddress none => localhost
- rfsim 5g eNB_IPAddress none => localhost
- flexric eNB_IPAddress none => localhost
- l2sim 4g eNB_IPAddress none => localhost
- l2sim 4G eNB1_IPAddress 172.21.16.128 => obelix => localhost