GIT: orientFaceZone: remove embedded testcase

.../utilities/mesh/manipulation/orientFaceZone/cavity/Allrun

...lities/mesh/manipulation/orientFaceZone/cavity/README.txt

...ion/orientFaceZone/cavity/constant/polyMesh/blockMeshDict

...pulation/orientFaceZone/cavity/constant/polyMesh/boundary

...lation/orientFaceZone/cavity/constant/transportProperties

...esh/manipulation/orientFaceZone/cavity/system/controlDict

...anipulation/orientFaceZone/cavity/system/decomposeParDict

.../mesh/manipulation/orientFaceZone/cavity/system/fvSchemes

...mesh/manipulation/orientFaceZone/cavity/system/fvSolution

...anipulation/orientFaceZone/cavity/system/renumberMeshDict

...esh/manipulation/orientFaceZone/cavity/system/topoSetDict