## What changes were proposed in this pull request?

Hive Metastore DB schema may be manually pre-created to save time during 
initial service start.  However, `schematool` could still take quite some time 
to confirm that the schema exists.  The goal of this change is to allow users 
who pre-create Hive Metastore DB schema to make Ambari skip managing the DB 
(create or check existence).

https://issues.apache.org/jira/browse/AMBARI-24548

## How was this patch tested?

Deployed cluster via blueprint with pre-created Hive Metastore DB. Confirmed 
that `schematool` call is skipped:

```
Skipping creation of Hive Metastore schema as host is sys prepped
```

Ran Hive service check.

[ Full content available at: https://github.com/apache/ambari/pull/2199 ]
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