Change ugly `namespace_` variable format in controller manager and controller interface.

[destogl]

Background

Rename the argument to node_namespace because namespace is reserved C++ keyword. Please do the following:

• [ ] rename argument in ControllerInterface files
• [ ] rename argument in ControllerManager files
• [ ] Execute all tests on controller_interface and controller_manager package to be sure that everything works.

Instructions

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[ParisaTork]

Happy to do this for you, if you'd like?

[ParisaTork]

Has this issue already been resolved?

[bailaC]

@destogl I will start working on this.

[bailaC]

https://github.com/ros-controls/ros2_control/pull/1239

[bailaC]

@destogl we can close this.