In case of query for disabled plugin it would be good to throw an 
`UserException` with an appropriate info that plugin is disabled.
The current message is not accurate enough:
```
org.apache.drill.common.exceptions.UserRemoteException: VALIDATION ERROR: 
Schema [[cp]] is not valid with respect to either root schema or current 
default schema. Current default schema: No default schema selected 
```

[ Full content available at: https://github.com/apache/drill/pull/1460 ]
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