Change the spamming checking interface ERROR to DEBUG

[saikishor]

@christophfroehlich pointed out that there is a spamming error of "Checking interface" while starting the controllers, this was not meant to be ERROR log, rather it must be a DEBUG log, it was introduced accidentally with #1021 changes.

Thank you for pointing it out @christophfroehlich

[fmauch]

Seems fair ;-)

[christophfroehlich]

thanks ;)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.29%. Comparing base (723c869) to head (0d25c44).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1605   +/-   ##
=======================================
  Coverage   87.29%   87.29%           
=======================================
  Files         108      108           
  Lines        9793     9793           
  Branches      886      886           
=======================================
  Hits         8549     8549           
  Misses        925      925           
  Partials      319      319           

Flag	Coverage Δ
unittests	87.29% <ø> (ø)

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Files	Coverage Δ
controller_manager/src/controller_manager.cpp	75.72% <ø> (ø)