Update the clm build-namelist unit test to remove warning.

Update the number of tests in template_test_XXX : startup to remove a
warning from the test system.

Fixes: Part of #19

User interface changes?: no

Code review: self

Test suite: test_build_namelist.pl - pass
Test baseline: n/a
Test namelist changes: n/a
Test answer changes: n/a
Test summary: n/a

components/clm/bld/test_build_namelist/t/template_test_XXX.pm

@@ -13,7 +13,7 @@ use parent qw(Test::Class);
 # Common test fixture for all tests:
 #
 #-------------------------------------------------------------------------------
-sub startup : Test(startup => 3) {
+sub startup : Test(startup => 4) {
   my $self = shift;
   # provide common fixture for all tests, only created once at the
   # start of the tests.