Changed the default CDash URL for VTK

The CDash instance was moved to open.cdash.org some time ago, update
out configuration to reflect its current location.

Change-Id: Ic1a897339571bafebbabbecbeb1e73814d1acf6e

CTestConfig.cmake

@@ -8,6 +8,6 @@ set(CTEST_PROJECT_NAME "VTK")
 set(CTEST_NIGHTLY_START_TIME "01:00:00 UTC")
 
 set(CTEST_DROP_METHOD "http")
-set(CTEST_DROP_SITE "www.cdash.org")
-set(CTEST_DROP_LOCATION "/CDash/submit.php?project=VTK")
+set(CTEST_DROP_SITE "open.cdash.org")
+set(CTEST_DROP_LOCATION "/submit.php?project=VTK")
 set(CTEST_DROP_SITE_CDASH TRUE)