OpenFOAM.org commits for
  src/TurbulenceModels/turbulenceModels/derivedFvPatchFields/wallFunctions
were reviewed.

The parts of the commits made by OpenFOAM.org removing various code
duplications across wall functions were picked up by keeping the remaining
functionalities the same.

The duplications were mainly due to:
  - wall function model coefficients
  - yPlusLam(), checkPatch(), write() methods

The duplications were united under the base nutWallFunction.