ros2controlcli: use-sim-time

[christophfroehlich]

With #1132 I also saw now that the help shows two options coming from ros2cli

  --spin-time SPIN_TIME
                        Spin time in seconds to wait for discovery (only applies when not using an already running daemon)
  -s, --use-sim-time    Enable ROS simulation time

The latter is sometimes part of the docs, sometimes not. it was introduced 2 years ago, that's maybe why.

As far as I understand ros2cli, it creates a node which then is used for calling the services with our ros2controlcli? Does it make a difference if use-sim-time is set for the service client, or not?

I'd correct/complete the docs but want to understand it first.