add initial db_test: creating and deleting subscribers

Change-Id: I2a0d277f55162bf5ceb0fc7d50390f2994daed71
diff --git a/configure.ac b/configure.ac
index 167d7f3..1db32d4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -70,4 +70,5 @@
 	tests/auc/Makefile
 	tests/auc/gen_ts_55_205_test_sets/Makefile
 	tests/gsup_server/Makefile
+	tests/db/Makefile
 	)