AbstractKeyManager: deprecate authorization APIs
AbstractKeyManager: deprecate authorization APIs

The AbstractKeyManager is going to be just a key provider. The authorization
functionality is implemented in another class, KeyAuthorizer, which will soon
be part of this library.

plotters/accounts-sso.signond,plotters/accounts-sso.signond,maemo-foss/accounts-sso-signon,maemo-foss/accounts-sso-signon,maemo-foss/accounts-sso-signon,plotters/accounts-sso.signond