BUG: TestSetGet crashes

TestSetGet tries to test the singleton vtkTextRenderer. This causes
segfaults on some systems. This patch exempts vtkTextRenderer from the
test.

Change-Id: I751b8016ea1339715a4c588954f7320e17f7deb4
Merge topic 'Valgrind_TestSetGet' into master

13544910 BUG: TestSetGet crashes