Javadoc
This method releases the liquibase db lock after a crashed database update. First, it
checks whether "liquibasechangeloglock" table exists in db. If so, it will check
whether the database is locked. If that is also true, this means that last attempted db
update crashed.
This should only be called if the user is sure that no one else is currently running
database updates. This method should be used if there was a db crash while updates
were being written and the lock table was never cleaned up.