Commits on Mar 23, 2021

1. use const auto & to iterate over parameters …

   Clang is complaining about the looping variable being referenced as `const val` but should rather be `const ref`.
   
   ```
   /Users/karsten/workspace/ros2/ros2_master/src/ros2/rclcpp/rclcpp/src/rclcpp/parameter_service.cpp:46:25: error: loop variable 'param' of type 'const rclcpp::Parameter' creates a copy from type 'const rclcpp::Parameter' [-Werror,-Wrange-loop-construct]
           for (const auto param : parameters) {
                           ^
   /Users/karsten/workspace/ros2/ros2_master/src/ros2/rclcpp/rclcpp/src/rclcpp/parameter_service.cpp:46:14: note: use reference type 'const rclcpp::Parameter &' to prevent copying
           for (const auto param : parameters) {
                ^~~~~~~~~~~~~~~~~~
                           &
   1 error generated.
   ```
   
   Signed-off-by: Karsten Knese <Karsten1987@users.noreply.github.com>

   

   Karsten1987 committed Mar 23, 2021
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