DRILL-4964: Make Drill reconnect to hive metastore after hive metastore is restarted.
Drill fails to connect to hive metastore after hive metastore is restarted unless drillbits are restarted.
Changes: For methods DrillHiveMetaStoreClient.getAllDatabases() and DrillHiveMetaStoreClient.getAllTables(),
the HiveMetaStoreClient wraps MetaException and TException both into MetaException. In case of connection
failure which is thrown as TException it is difficult to categorize at DrillClient level. The fix is to
close older connection and reconnect in case of these 2 api's. In all other cases proper set of exceptions
are thrown where we can handle each one individually.
close apache/drill#628
