move logging section to be under "kafka:" key (#3238)
move logging section to be under "kafka:" key (#3238)

previous configuration (with logging directly under "spec:" key), resulted in "Contains object at path spec with an unknown property: logging" error from operator

Signed-off-by: James Sullivan <2d51c092e571f420f35bed70e2cde87edce1861b@gmx.at>

ppatierno/kaas,scholzj/barnabas,scholzj/barnabas,ppatierno/kaas