* merge with system settings before storing them in the db
* add base for validating sso settings
* add unit tests for sso settings validation
* call Reload() from sso service upsert()
* remove actual validation because it was moved in a separate pr
* use constant to fix lint error
* check if provider is configurable in service Upsert() method
* add unit tests for update provider settings api method
* fix lint error
Mihai Doarna
ade91e5038