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* Disable SSH key addition and deletion when externally managed When a user has a login source which has SSH key management key addition and deletion using the UI should be disabled. Fix #13983 Signed-off-by: Andrew Thornton <art27@cantab.net> * Make only externally managed keys disabled Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>