func (kvs *KVS) Delete(key string) {
	for i, kv := range *kvs {
		if kv.Key == key {
			*kvs = append((*kvs)[:i], (*kvs)[i+1:]...)
			return
		}
	}
}

// LookupKV returns the KV by its key
func (kvs KVS) LookupKV(key string) (KV, bool) {
	for _, kv := range kvs {
		if kv.Key == key {
			return kv, true
		}
	}
	return KV{}, false
}

// Lookup - lookup a key in a list of KVS