Removing Tcl tests the duplicate existing Python testing.

The TestPDataSetReaderGrid Tcl test was failing anyways since
it wasn't updated when the matching Python script was updated for
changes.

Change-Id: Ib59e1df2b8b31e8fbf8218faa049c66c65fe07f8
Merge topic '15021_remove_duplicate_Tcl_test' into master

f9ecca43 Removing Tcl tests the duplicate existing Python testing.