Add missing option for ajax call in settings/configuration/databases.
Add missing option for ajax call in settings/configuration/databases.

https://bugzilla.redhat.com/show_bug.cgi?id=1272266
(transferred from ManageIQ/manageiq@0da543c2ca7fbbe524a2ea91868f3a335390c60e)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic