Cleanup removed msg fields

[christophfroehlich]

PID is broken now since ros-controls/control_msgs#178 (comment)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.38%. Comparing base (b1f2619) to head (e1cec98).
Report is 2 commits behind head on ros2-master.

Additional details and impacted files

@@               Coverage Diff               @@
##           ros2-master     #346      +/-   ##
===============================================
- Coverage        77.41%   77.38%   -0.04%     
===============================================
  Files               29       29              
  Lines             1333     1331       -2     
  Branches            92       92              
===============================================
- Hits              1032     1030       -2     
  Misses             250      250              
  Partials            51       51              

Flag	Coverage Δ
unittests	77.38% <ø> (-0.04%)	⬇️

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Files with missing lines	Coverage Δ
control_toolbox/src/pid_ros.cpp	73.88% <ø> (-0.29%)	⬇️

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