evolution-source-registery needs a restart to pick newly activated uoa accounts

[Sebastien Bacher]

Using current xenial version
- go to the uoa settings
- add a google account

- > you get a notification that there is an auth issue (that's a weird workflow but needed because the application needs to auth but e-d-s can't do UI prompting)

- auth e-d-s in the settings

-> the new account should be active/listed in the indicator or gnome-calendar but is not

The issue is probably that e-d-s connect to the "account-created" signal on a AgManager object and adds the account correctly, but at this point the authentification/confirmation is not done yet so the account fails to active, and there is no following callback after the authentification is done.

It seems that AgManager doesn't provide an appropriate signal that can be used there so some work might be needed on the signon side