[DiffDriveController] Optional tf namespace prefixes instead of using node namespace (backport #533)

[mergify]

This is an automatic backport of pull request #533 done by Mergify.
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Changes to be committed:
	modified:   diff_drive_controller/src/diff_drive_controller_parameter.yaml
	modified:   diff_drive_controller/test/test_diff_drive_controller.cpp

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	both modified:   diff_drive_controller/src/diff_drive_controller.cpp

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[bobbleballs]

@bmagyar Any chance this could get merged in?

[bmagyar]

Not with the current conflict in place... Wanna fix it via comments? I can commit those (from the phone, at roscon) and see if the CI is happy.

[bobbleballs]

Not with the current conflict in place... Wanna fix it via comments? I can commit those (from the phone, at roscon) and see if the CI is happy.

We can try!
I think I've done it correctly... Got it mixed up the first time 😆

[christophfroehlich]

Failing tests come from JTC tests having hiccups

[codecov]

Codecov Report

Merging #726 (b84fe03) into humble (df59eec) will decrease coverage by 0.38%.
The diff coverage is 20.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           humble     #726      +/-   ##
==========================================
- Coverage   45.21%   44.84%   -0.38%     
==========================================
  Files          40       40              
  Lines        3709     3713       +4     
  Branches     1765     1769       +4     
==========================================
- Hits         1677     1665      -12     
- Misses        821      835      +14     
- Partials     1211     1213       +2     

Flag	Coverage Δ
unittests	44.84% <20.00%> (-0.38%)	⬇️

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

Files	Coverage Δ
...iff_drive_controller/src/diff_drive_controller.cpp	41.07% <20.00%> (-3.64%)	⬇️

... and 2 files with indirect coverage changes

[bmagyar]

Thank you!