Submit only to testing-vm.sandia.gov/cdash/ (trilinos#3285)

This is one of the steps to transition from testing.sandia.gov/cdash/ to
testing-vm.sandia.gov/cdash/.  We need to turn off submits to
testing.sandia.gov/cdash/ in all automated builds before we create a redirect
from testing.sandia.gov/cdash/ to testing-vm.sandia.gov/cdash/ since I am not
sure how CDash will handle duplicate submits of the same data for the same
builds.

CTestConfig.cmake

@@ -10,14 +10,9 @@ IF (NOT DEFINED CTEST_DROP_METHOD)
 ENDIF()
 
 IF (CTEST_DROP_METHOD STREQUAL "http" OR CTEST_DROP_METHOD STREQUAL "https")
-  SET_DEFAULT_AND_FROM_ENV(CTEST_DROP_SITE "testing.sandia.gov")
+  SET_DEFAULT_AND_FROM_ENV(CTEST_DROP_SITE "testing-vm.sandia.gov")
   SET_DEFAULT_AND_FROM_ENV(CTEST_PROJECT_NAME "Trilinos")
   SET_DEFAULT_AND_FROM_ENV(CTEST_DROP_LOCATION "/cdash/submit.php?project=Trilinos")
   SET_DEFAULT_AND_FROM_ENV(CTEST_TRIGGER_SITE "")
   SET_DEFAULT_AND_FROM_ENV(CTEST_DROP_SITE_CDASH TRUE)
-  # Temp secondary submit to experimental CDash site (see #1746)
-  SET_DEFAULT_AND_FROM_ENV(TRIBITS_2ND_CTEST_DROP_SITE
-    "testing-vm.sandia.gov")
-  SET_DEFAULT_AND_FROM_ENV(TRIBITS_2ND_CTEST_DROP_LOCATION
-    "/cdash/submit.php?project=Trilinos")
 ENDIF()