Improved tf_prefix based on namespace

[rafal-gorecki]

Fix test related with: #1060

[saikishor]

Looks good to me!
I believe the tests should work as the changes are minimal

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.61%. Comparing base (66d160c) to head (1688fca).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1420   +/-   ##
=======================================
  Coverage   83.61%   83.61%           
=======================================
  Files         122      122           
  Lines       11016    11019    +3     
  Branches      933      935    +2     
=======================================
+ Hits         9211     9214    +3     
  Misses       1495     1495           
  Partials      310      310           

Flag	Coverage Δ
unittests	83.61% <100.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...iff_drive_controller/src/diff_drive_controller.cpp	76.98% <100.00%> (+0.46%)	⬆️
...ive_controller/test/test_diff_drive_controller.cpp	93.64% <100.00%> (+0.03%)	⬆️

... and 1 file with indirect coverage changes

[christophfroehlich]

Thanks for fixing it!