Tony Murray 5141fc4872 refactor: Share code between all mysql based authorizers (#8174)
* Share code between all mysql based authorizers
I plan to update the mysql password encryption and this will allow the code to be changed in a single location.
It also reduces a lot of duplication.

* Fix tests, I suspect reauthenticate will work for these...
Do not allow password updates for several authorizers
2018-02-06 21:20:34 +00:00
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