Handle SIGINT properly in the ros2_control_node

[saikishor]

Related to #2012

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.45%. Comparing base (d4139b7) to head (c11211b).

Files with missing lines	Patch %	Lines
controller_manager/src/ros2_control_node.cpp	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2014      +/-   ##
==========================================
+ Coverage   89.38%   89.45%   +0.07%     
==========================================
  Files         132      132              
  Lines       14663    14688      +25     
  Branches     1258     1265       +7     
==========================================
+ Hits        13106    13139      +33     
+ Misses       1090     1085       -5     
+ Partials      467      464       -3     

Flag	Coverage Δ
unittests	89.45% <96.87%> (+0.07%)	⬆️

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

Files with missing lines	Coverage Δ
.../include/controller_manager/controller_manager.hpp	100.00% <ø> (ø)
controller_manager/src/controller_manager.cpp	76.58% <100.00%> (+0.30%)	⬆️
...ller_manager/test/test_ros2_control_node_launch.py	100.00% <100.00%> (ø)
hardware_interface/src/resource_manager.cpp	75.65% <100.00%> (+0.62%)	⬆️
controller_manager/src/ros2_control_node.cpp	62.50% <91.66%> (+0.68%)	⬆️

... and 3 files with indirect coverage changes