command property: replace string concatenation by taking over given list

[alpex8]

Hi,

I noticed that the script is converting the command property. The specification allows to have

1. a string where arguments are separated by whitespaces

   command: mycommand arg1 arg2 --flag1 'param'

2. a list where all arguments are list items

   command:
   - mycommand
   - arg1
   - arg2
   - --flag1
   - \'param\'

However the Script generated a List with one string item that included all arguments. That resulted in an error.

command:
  - mycommand arg1 arg2 --flag1 'param'

Thus I removed the usage of " ".join() and took over the list which is generated by docker anyway.

Furthermore I came across the issue that the script only collects the networks to which the last container is connected. This has also been fixed.