scollectd_test: Add test case for descriptions
scollectd_test: Add test case for descriptions

syuu1228/seastar,dreamsxin/seastar,syuu1228/seastar,cloudius-systems/seastar,cloudius-systems/seastar,scylladb/seastar,cloudius-systems/seastar,kjniemi/seastar,scylladb/seastar,kjniemi/seastar,avikivity/seastar,avikivity/seastar,syuu1228/seastar,avikivity/seastar,kjniemi/seastar,scylladb/seastar,dreamsxin/seastar,dreamsxin/seastar