Add missing config file for the previously commited test case.

test/box/tarantool_bug735140.cfg

+slab_alloc_arena = 0.1
+
+pid_file = "box.pid"
+
+
+# Use -a not -a to work correctly on FreeBSD
+#
+logger="tee -a tarantool.log"
+
+primary_port = 33013
+secondary_port = 33014
+admin_port = 33015
+
+rows_per_wal = 50
+
+namespace[0].enabled = 1
+namespace[0].index[0].type = "HASH"
+namespace[0].index[0].unique = 1
+namespace[0].index[0].key_field[0].fieldno = 0
+namespace[0].index[0].key_field[0].type = "STR"
+namespace[0].index[1].type = "TREE"
+namespace[0].index[1].unique = 0
+namespace[0].index[1].key_field[0].fieldno = 1
+namespace[0].index[1].key_field[0].type = "STR"
+