Add method to clear DB cache #4
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This relates to github/gh-ost#465 and a PR I'm about to submit to allow gh-ost to be consumed as a library.
When using
gh-ostin a long running process, the DB connections get closed but due to the caching here, subsequent migrations fail because the connection has already been closed. This PR exposes a function that can be used to reset the cache, allowing new connections to be established when necessary. This method would typically be called as a part of teardown from the consumer