Reduce HMS call when creating HiveSession

When establishing HiveSession, it ends up configuring session variables/settings.

As part of it, it ends up checking the database details. https://github.com/apache/hive/blob/master/service/src/java/org/apache/hive/service/cli/session/HiveSessionImpl.java#L314

Even if it is `default` DB, it ends up making this check. In corner cases, these calls turn out to be expensive.

2019-08-13T03:16:57,189  INFO [b42ba57f-1740-4174-855d-4e3f08319ca5 HiveServer2-Handler-Pool: Thread-1552313] metadata.Hive: Total time spent in this metastore function was greater than 1000ms : getDatabase_(String, )=13265

We can just skip this check if its `DEFAULT_DATABASE_NAME` (default) DB. This may not be an issue for CachedStore.