Avoid running joint limit enforcement during initialization

[saikishor]

Fixes ros-controls/ros2_control_demos#783

[christophfroehlich]

Thanks for the quick fix!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.09%. Comparing base (495d2b7) to head (362ae1a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2188      +/-   ##
==========================================
+ Coverage   89.05%   89.09%   +0.03%     
==========================================
  Files         139      139              
  Lines       16114    16117       +3     
  Branches     1388     1389       +1     
==========================================
+ Hits        14350    14359       +9     
+ Misses       1231     1226       -5     
+ Partials      533      532       -1     

Flag	Coverage Δ
unittests	89.09% <100.00%> (+0.03%)	⬆️

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Files with missing lines	Coverage Δ
hardware_interface/src/resource_manager.cpp	76.79% <100.00%> (-0.09%)	⬇️

... and 2 files with indirect coverage changes

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