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session: Threat PAM max retries error as service unavailable

Marco Trevisan requested to merge 3v1n0/gdm:mark-max-retries-unavailable into master

When a service has returned PAM_MAXTRIES error code we should both emit the error message and also ensure that this service isn't marked as available again for the current session, to prevent us to restart the authentication of it.

An example of this can be the PAM fprintd module that will return us a max retries error when the user tried to use his finger more times than configured. In such scenario we want to both prompt the error to the user and prevent that this module is used again if the user can still use other authentication methods.

So add an error specialization for PAM_MAXTRIES and threat it as service unavailable error when emitting it.

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