Drill does not release DB connections when a storage plugin is deleted

[Rahul Raj <ra...@option3.io>]

Drill does not release the database connection when we disable or delete a
storage plugin.
It can be seen with "lsof -i -p <<drillpid>> | grep <<db-host-ip>>" that
the number of socket connections to db host keep increasing if we keep
updating an existing storage plugin.

JdbcStoragePlugin does not override AbstractStoragePlugin#close and leaves
basic datasource open when the plugin is destroyed.

Can someone verify this? I will raise a defect and provide a fix.

Regards,
Rahul

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