tests: Reduce the iterations for the timertest, ignore stderr

Use one of the magic commands for the stderr, in this case we want
to log the output but ignore it for processing.

http://www.gnu.org/s/hello/manual/autoconf/Writing-Testsuites.html#Writing-Testsuites
diff --git a/tests/testsuite.at b/tests/testsuite.at
index df5a5e8..0e917f1 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -35,7 +35,7 @@
 AT_SETUP([timer])
 AT_KEYWORDS([timer])
 cat $abs_srcdir/timer/timer_test.ok > expout
-AT_CHECK([$abs_top_builddir/tests/timer/timer_test], [], [expout])
+AT_CHECK([$abs_top_builddir/tests/timer/timer_test -s 5], [], [expout], [ignore])
 AT_CLEANUP
 
 AT_SETUP([ussd])