haixunlu 68a6579852 login_source: add default authentication switch (#5338)
* Add default Authentication Switch.

* adjust the code accroding to reviews

* #1. Remove redudant logic.
#2, Fix a bug in "Edit" panel.

* Remove unused logic

* Fix local authentication files are not flushed.

* refactor according to review.
2018-09-13 13:49:07 -04:00
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