Fix regression in dnstap_test with native pkcs11

Change to cmocka broken initialization of TZ environment. This time,
commit 1cf1254051 is not soon enough. Has
to be moved more forward, before any other tests. It library is not full
reinitialized on each test.

(cherry picked from commit 71c4fad592)

lib/dns/tests/dnstap_test.c

@@ -312,9 +312,6 @@ totext_test(void **state) {
 
 	UNUSED(state);
 
-	/* make sure text conversion gets the right local time */
-	setenv("TZ", "PST8", 1);
-
 	result = dns_dt_open(TAPSAVED, dns_dtmode_file, mctx, &handle);
 	assert_int_equal(result, ISC_R_SUCCESS);
 
@@ -381,6 +378,9 @@ main(void) {
 		cmocka_unit_test_setup_teardown(totext_test, _setup, _teardown),
 	};
 
+	/* make sure text conversion gets the right local time */
+	setenv("TZ", "PST8", 1);
+
 	return (cmocka_run_group_tests(tests, NULL, NULL));
 #else
 	print_message("1..0 # Skip dnstap not enabled\n");