[ros2_control_node] add thread_priority option to the ros2_control_node

[saikishor]

Right now, the thread_priority is hard-coded to 50, this PR allows the users to be able to choose their desired priority by setting a parameter at launch time

ros2_control/controller_manager/src/ros2_control_node.cpp

Line 32 in b0da4a1

int const kSchedPriority = 50;

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.62%. Comparing base (b0da4a1) to head (6a6a837).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
controller_manager/src/ros2_control_node.cpp	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1820      +/-   ##
==========================================
+ Coverage   87.60%   87.62%   +0.02%     
==========================================
  Files         120      120              
  Lines       12223    12223              
  Branches     1093     1093              
==========================================
+ Hits        10708    10711       +3     
+ Misses       1125     1123       -2     
+ Partials      390      389       -1     

Flag	Coverage Δ
unittests	87.62% <66.66%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
controller_manager/src/ros2_control_node.cpp	88.57% <66.66%> (+0.33%)	⬆️

... and 1 file with indirect coverage changes

[christophfroehlich]

LGTM.
I realized that we don't mention the ros2_control_node not even once in the docs. Should we?

[saikishor]

LGTM.
I realized that we don't mention the ros2_control_node not even once in the docs. Should we?

I think it's a good idea. It gives some idea on how to instantiate their control stack.