EZEE-2988: As an Editor, I want to schedule hiding of a content item

[adamwojs]

JIRA: https://jira.ez.no/browse/EZEE-2988

Description

Schema changes required for "schedule hiding" feature.

Upgrade existing databases (WIP)

MySQL

ALTER TABLE  `ezdatebasedpublisher_scheduled_version` 
CHANGE COLUMN `publication_date` `date` INT(11) NOT NULL ,
ADD COLUMN `action` VARCHAR(32) NOT NULL AFTER `url_root`;

PostgreSQL

ALTER TABLE ezdatebasedpublisher_scheduled_version RENAME COLUMN publication_date TO date;
ALTER TABLE ezdatebasedpublisher_scheduled_version ADD COLUMN action VARCHAR(32) NOT NULL;