
This PR changes the way to check instance status. Since Victoria, trove
has change the db instance status name from `RUNNING` to `HEALTHY`[1].
Original problem:
Some clustering databases like Apache Cassandra fail to update cluster
status because they check db instance status using `RUNNING`.
[1]: a0a10f0b94
Story: 2010147
Task: 45791
Change-Id: Iaa032fb46ed51b6e416e7d4efdfd272924ba146b