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* Add pre-upgrade script to be run on first master.Devan Goodwin2015-11-061-0/+185
Script currently just checks for port names that are no longer valid. In theory other checks may be added to this script in the future. Script was originally written by Steve Milner and Andy Goldstein. If the script fails, ansible seems to handle this nicely by default, exiting the upgrade and displaying stderr and stdout, both of which contain useful info on what the problem was.