gitignore: add tests/hlr_vty_test.db*

Ignore files generated from the VTY test.

Change-Id: I8f55f655fd6694ac9db7e6280670d16fad61ee72
diff --git a/.gitignore b/.gitignore
index c08a612..0397e35 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,7 @@
 tests/gsup_server/gsup_server_test
 tests/gsup/gsup_test
 tests/db/db_test
+tests/hlr_vty_test.db*
 
 # manuals
 doc/manuals/*.html