MCOL-4328 MCS avoids chown() calls for files that are on S3

MCS now chowns created directories hierarchy not only files and
immediate parent directories

Minor changes to cpimport's help printout

cpimport's -f option is now mandatory with mode 2

writeengine/shared/we_fileop.h

@@ -58,6 +58,8 @@
 namespace WriteEngine
 {
 
+constexpr size_t MaxDirLevels = 5;
+
 /** Class FileOp */
 class FileOp : public BlockOp, public WeUIDGID
 {
@@ -503,8 +505,7 @@ public:
                                           bool     bOptExtension=false );
 
     // Calls a chown and logs an error message
-    bool                chownDataFileDir(std::ostringstream& error, 
-                                         const std::string& fileName);
+    bool                chownDataPath(const std::string& fileName) const;
 
 protected:
     EXPORT virtual int         updateColumnExtent(IDBDataFile* pFile, int nBlocks);