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/dictionary/we_dctnry.cpp

@@ -219,8 +219,7 @@ int  Dctnry::createDctnry( const OID& dctnryOID, int colWidth,
         {
             // We presume the path will contain /
             std::string filePath(fileName);
-            std::ostringstream ossChown;
-            if (chownDataFileDir(ossChown, filePath))
+            if (chownDataPath(filePath))
             {
                 return ERR_FILE_CHOWN;
             }